Nakanotani Hajime
| Research Institute for Electronic Science Photonics and Optical Science | Professor |
Last Updated :2025/07/09
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■Career
Career
- Apr. 2025 - Present
Hokkaido University, Research Institute for Electronic Science, 教授 - Jan. 2015 - Mar. 2025
Kyushu University, 大学院工学研究院応用化学部門, Associate Professor - Apr. 2014 - Dec. 2014
Kyushu University, 最先端有機光エレクトロニクス研究センター - Apr. 2012 - Mar. 2014
Institute of Systems, Information Technologies and Nanotechnologies - Apr. 2010 - Mar. 2012
株式会社リコー
Educational Background
Committee Memberships
■Research activity information
Awards
- Jun. 2016, 有機EL討論会, 有機EL討論会 業績賞
蛍光材料を発光材料とする有機ELデバイスの発光層中に熱活性化遅延蛍光（TADF）材料をアシストドーパントとしてドーピングすることで、理論上の内部発光効率を100%まで向上させることに成功した。本手法は従来の高い蛍光量子収率かつ高い耐久性を持つ材料の特徴を最大限利用することが可能としており、TADF材料を発光材料として用いた有機ELデバイスで課題であった信頼性向上と色純度向上を実現する汎用性の高い技術である。これらの実績は、有機ELの高性能化に大きく寄与することが期待され、業績賞に値するものである。 - May 2016, 応用物理学会 有機分子・バイオエレクトロニクス分科会, 第14回応用物理学会 有機分子・バイオエレクトロニクス分科会奨励賞
熱活性化遅延蛍光過程を利用した高性能蛍光有機EL素子の実現 - 2013, 有機EL討論会, 第17回有機EL討論会 講演奨励賞
熱活性化遅延蛍光有機ＥＬ素子における素子劣化因子の解明
中野谷一 - Mar. 2009, 応用物理学会, 講演奨励賞
有機単結晶薄膜を用いた有機EL素子
中野谷一
Papers
- Dominant Parameters Affecting Device Durability for Blue TADF Molecules
Masashi Mamada, Thanh Ba Nguyen, Hajime Nakanotani, Takuji Hatakeyama, Chihaya Adachi
Advanced Optical Materials, 07 Jul. 2025
Scientific journal - Common mechanism of dual emission in linearly-linked donor–acceptor-type thermally activated delayed fluorescence molecules
Tomohiro Ryu, Arvydas Ruseckas, Masaki Saigo, Kiyoshi Miyata, Youichi Tsuchiya, Hajime Nakanotani, Chihaya Adachi, Ifor D. W. Samuel, Ken Onda
Physical Chemistry Chemical Physics, 2025
Scientific journal - Anti‐Stokes Emission Utilizing Reverse Intersystem Crossing
Chihaya Adachi, Shintaro Kohata, Hajime Nakanotani, Takuya Hosokai, Takuma Yasuda, Youichi Tsuchiya
Angewandte Chemie International Edition, 64, 7, 21 Nov. 2024, [Peer-reviewed], [Corresponding author]
English, Scientific journal - Organic thermoelectric device utilizing charge transfer interface as the charge generation by harvesting thermal energy
Shun Kondo, Mana Kameyama, Kentaro Imaoka, Yoko Shimoi, Fabrice Mathevet, Takashi Fujihara, Hiroshi Goto, Hajime Nakanotani, Masayuki Yahiro, Chihaya Adachi
Nature Communications, 19 Sep. 2024, [Peer-reviewed]
Scientific journal - Spacer dependence of exciplex dynamics in donor/spacer/acceptor layers
Tharindu P.B. Rajakaruna, Xun Tang, Hajime Nakanotani, Chihaya Adachi
Chemical Physics Letters, 848, 141390, 141390, Elsevier BV, Aug. 2024
Scientific journal - Simultaneous control of carrier transport and film polarization of emission layers aimed at high-performance OLEDs
Masaki Tanaka, Chin-Yiu Chan, Hajime Nakanotani, Chihaya Adachi
Nature Communications, 16 Jul. 2024, [Peer-reviewed]
Scientific journal - Efficient Near‐Infrared Fluorescence in Deuterated Host–Guest System for Near‐Infrared Organic Light‐Emitting Diodes
Qun Yu, Yuika Tamura, Hajime Nakanotani, Masashi Mamada, Chihaya Adachi
Advanced Optical Materials, Jul. 2024, [Peer-reviewed], [Corresponding author]
Scientific journal - Unexplored Exciplex Formation by Dual Excitation of Donor and Acceptor Layers Optically and Electrically
Tharindu P. B. Rajakaruna, Xun Tang, Hajime Nakanotani, Chihaya Adachi
Advanced Optical Materials, 12, 28, Wiley, 24 Jun. 2024
Scientific journal, Abstract
Electron donor and acceptor interactions are the fundamentals for the emergence of optoelectronic functions in most organic devices. In particular, exciplexes, which hold the possibility to utilize dark triplets, are widely investigated in organic light‐emitting diodes. However, the relatively low radiative decay rate with a low photoluminescence quantum yield poses further advanced challenges. Traditionally, it is well recognized that exciplexes are formed through a charge transfer process, i.e., direct electron transfer, by photoexciting either a donor or an acceptor component. In this study, the focus is on a long‐range exciplex system where tris(4‐carbazoyl‐9‐ylphenyl)amine (TCTA) and 2,4,6‐tris[3‐(diphenylphosphinyl)phenyl]−1,3,5‐triazine (PO‐T2T) serve as the donor and acceptor, respectively. Moreover, 1,2‐bis(triphenylsilyl) benzene (UGH2) and bis[2‐(diphenylphosphino)phenyl]ether oxide (DPEPO), having a wide energy gap and a high triplet energy level, are employed as the double insulating layer to suppressing direct electron transfer between the donor and acceptor. The indirect through‐space exciplex formation is demonstrated by the simultaneous excitation of both donor and acceptor layers optically and electrically, providing a new route for exciplex formation. - Impact of Spontaneous Orientational Polarization on Triplet–Triplet Upconversion-Based Blue Organic Light-Emitting Diodes
Shunta Kakumachi, Hajime Nakanotani, Yuto Nagasaki, Chihaya Adachi
ACS Applied Materials & Interfaces, 19 Jun. 2024, [Peer-reviewed], [Corresponding author]
Scientific journal - Hexacarbazolylbenzene: An Excellent host Molecule Causing Strong Guest Molecular Orientation and the high-Performance OLEDs.
Bhagya Madushani, Masashi Mamada, Kenichi Goushi, Hiroshi Katagiri, Hajime Nakanotani, Takuji Hatakeyama, Chihaya Adachi
Advanced materials (Deerfield Beach, Fla.), e2402275, 12 Jun. 2024, [Peer-reviewed], [International Magazine]
English, Scientific journal, Hexacarbazolylbenzene (6CzPh), which is benzene substituted by six carbazole rings, is a simple and attractive compound. Despite the success of a wide variety of carbazole derivatives in organic light-emitting diodes (OLEDs), 6CzPh has not received attention so far. Here, we reveal excellent performances of 6CzPh as a host material in OLEDs regarding conventional host materials. Various strategies have been implemented to improve the performance of OLEDs, e.g., triplet utilization by thermally activated delayed fluorescence (TADF) and phosphorescence emitters for maximizing internal quantum efficiency, and molecular orientation control for increasing outcoupling efficiency. The present host material is suited for both criteria. Robustness of the structure and sufficiently high triplet energy enables a high external quantum efficiency with a long device lifetime. Besides, the host material boosts the horizontal molecular orientations of several guest emitters. It is noteworthy that disk-shaped 4CzIPN marks the complete horizontal molecular orientations (Θh = 100%, S = -0.50). These results provide an effective way of improving efficiencies without sacrificing device durability for future OLEDs. This article is protected by copyright. All rights reserved. - Suppressed Gold Penetration with the Molybdenum Oxide Interlayer to Increase Power Conversion Efficiency of Perovskite Solar Cells
Badamgarav Purev‐Ochir, Jun Tae Song, Pangpang Wang, Masayuki Yahiro, Sunao Yamada, Hajime Nakanotani, Toshinori Matsushima, Chihaya Adachi
Solar RRL, Wiley, 29 Mar. 2024, [Peer-reviewed]
Scientific journal, Perovskite solar cells (PSCs) have undergone an unprecedentedly rapid development in both power conversion efficiency (PCE) and operational durability. However, a number of unknown challenges remain before PSC products are ready to launch. Herein, it is demonstrated that the vacuum deposition of gold (Au) onto the organic hole‐transport layer (HTL) results in Au penetration into the perovskite layer. This Au penetration proves to be a limiting factor in PCE due to detrimental carrier recombination caused by the penetrated Au component inside the perovskite light absorber. To mitigate this issue, a thin molybdenum oxide (MoOx) interlayer between the organic HTL and the Au electrode is introduced, effectively reducing the Au penetration and suppressing the carrier recombination. Consequently, this MoOx introduction increases PCEs from ≈16.9% to ≈19.6% by ≈2.7%. Furthermore, using the MoOx interlayer improves the long‐term durability of PSCs. These findings are crucial in elucidating a basic mechanism that limits PCE and in advancing the fabrication of PSC products with even higher performance. - Three-dimensional sensing of surfaces by projection of invisible electroluminescence from organic light-emitting diodes
Nishiki Yamada, Hajime Nakanotani, Akitsuna Takagi, Masashi Mamada, Umamahesh Balijapalli, Tatsuya Ichikawa, Eiji Hirata, Shun Kaizu, Akira Tanaka, Kazuichiro Itonaga, Chihaya Adachi
Science Advances, 05 Jan. 2024, [Peer-reviewed], [Corresponding author]
Scientific journal - The role of spontaneous orientation polarization on charge storage behavior at an interface between organic semiconductor layers
Takahiko Yamanaka, Hajime Nakanotani, Chihaya Adachi
Journal of Materials Chemistry C, 2024, [Peer-reviewed], [Corresponding author]
Scientific journal - A polar transition of spontaneous orientation polarization in organic amorphous thin films
Yuuhi Ueda, Masaki Tanaka, Hajime Nakanotani, Chihaya Adachi
Chemical Physics Letters, 833, 140915, 140915, Elsevier BV, Dec. 2023, [Peer-reviewed], [Corresponding author]
Scientific journal - Anti‐Stokes Luminescence in Multi‐Resonance‐Type Thermally‐Activated Delayed Fluorescence Molecules
Shintaro Kohata, Hajime Nakanotani, Youhei Chitose, Takuma Yasuda, Youichi Tsuchiya, Chihaya Adachi
Angewandte Chemie International Edition, 26 Oct. 2023, [Peer-reviewed], [Corresponding author]
Scientific journal - Abrupt exciton quenching in blue fluorescent organic light-emitting diodes around turn-on voltage region
Shunta Kakumachi, Thanh Ba Nguyen, Hajime Nakanotani, Chihaya Adachi
Chemical Engineering Journal, Sep. 2023, [Peer-reviewed], [Corresponding author]
Scientific journal - Enhancing Triplet–Triplet Upconversion Efficiency and Operational Lifetime in Blue Organic Light-Emitting Diodes by Utilizing Thermally Activated Delayed Fluorescence Materials
Thanh B. Nguyen, Hajime Nakanotani, Chin-Yiu Chan, Shunta Kakumachi, Chihaya Adachi
ACS Applied Materials & Interfaces, 17 May 2023, [Peer-reviewed], [Corresponding author], [International Magazine]
Japanese, Scientific journal - Multiple donor–acceptor design for highly luminescent and stable thermally activated delayed fluorescence emitters
Bhagya Madushani, Masashi Mamada, Kenichi Goushi, Thanh Ba Nguyen, Hajime Nakanotani, Hironori Kaji, Chihaya Adachi
Scientific Reports, 13, 1, Springer Science and Business Media LLC, 11 May 2023, [Peer-reviewed]
Scientific journal, Abstract
A considerable variety of donor–acceptor (D–A) combinations offers the potential for realizing highly efficient thermally activated delayed fluorescence (TADF) materials. Multiple D–A type compounds are one of the promising families of TADF materials in terms of stability as well as efficiencies. However, those emitters are always composed of carbazole-based donors despite a wide choice of moieties used in linearly linked single D–A molecules. Herein, we developed a multiple D–A type TADF compound with two distinct donor units of 9,10-dihydro-9,9-dimethylacridine (DMAC) and carbazole as the hetero-donor design. The new emitter exhibits high photoluminescence quantum yield (PLQY) in various conditions including polar media blend and high concentrations. Organic light-emitting diodes (OLEDs) showed a reasonably high external quantum efficiency (EQE). In addition, we revealed that the multiple-D–A type molecules showed better photostability than the single D–A type molecules, while the operational stability in OLEDs involves dominant other factors. - Post-Modification of Pyrrolopyrrole Aza-BODIPY toward High Near-Infrared Fluorescence Brightness
Yitong Wang, Shigeki Mori, Hajime Nakanotani, Chihaya Adachi, Soji Shimizu
Organic Letters, 25, 17, 3040, 3044, American Chemical Society (ACS), 23 Apr. 2023, [Peer-reviewed]
Scientific journal - Electron Lifetime of Over One Month in Disordered Organic Solid‐State Films
Takahiko Yamanaka, Hajime Nakanotani, Katsuhiro Nakamoto, Chihaya Adachi
Advanced Materials, 35, 11, Wiley, 29 Jan. 2023, [Peer-reviewed], [Corresponding author]
Scientific journal - Solvent-dependent dual emission processes in charge-transfer excited states of phenothiazine-triphenyltriazine conformers
Tomohiro Ryu, Kiyoshi Miyata, Masaki Saigo, Yuushi Shimoda, Youichi Tsuchiya, Hajime Nakanotani, Chihaya Adachi, Ken Onda
Chemical Physics Letters, 809, 140155, 140155, Elsevier BV, Dec. 2022, [Peer-reviewed]
Scientific journal - Modulation of Intersystem Crossing Rate Induced by Singlet-triplet Energy Level Alignment in 1,2,3,5-Tetrakis(carbazol-9-yl)-4,6-dicyanobenzene Single Crystals
Shintaro Kohata, Hajime Nakanotani, Chihaya Adachi
Chemistry Letters, 51, 10, 989, 992, The Chemical Society of Japan, 05 Oct. 2022, [Peer-reviewed], [Corresponding author]
Scientific journal - Multiple resonance type thermally activated delayed fluorescence by dibenzo [1,4] azaborine derivatives
Jaehyun Bae, Mika Sakai, Youichi Tsuchiya, Naoki Ando, Xian-Kai Chen, Thanh Ba Nguyen, Chin-Yiu Chan, Yi-Ting Lee, Morgan Auffray, Hajime Nakanotani, Shigehiro Yamaguchi, Chihaya Adachi
Frontiers in Chemistry, 10, Frontiers Media SA, 19 Sep. 2022, [Peer-reviewed]
Scientific journal, We studied the photophysical and electroluminescent (EL) characteristics of a series of azaborine derivatives having a pair of boron and nitrogen aimed at the multi-resonance (MR) effect. The computational study with the STEOM-DLPNO-CCSD method clarified that the combination of a BN ring-fusion and a terminal carbazole enhanced the MR effect and spin-orbit coupling matrix element (SOCME), simultaneously. Also, we clarified that the second triplet excited state (T2) plays an important role in efficient MR-based thermally activated delayed fluorescence (TADF). Furthermore, we obtained a blue–violet OLED with an external EL quantum efficiency (EQE) of 9.1%, implying the presence of a pronounced nonradiative decay path from the lowest triplet excited state (T1). - Tailor-Made Multi-Resonance Terminal Emitters toward Narrowband, High-Efficiency, and Stable Hyperfluorescence Organic Light-Emitting Diodes
Yi-Ting Lee, Chin-Yiu Chan, Masaki Tanaka, Masashi Mamada, Kenichi Goushi, Xun Tang, Youichi Tsuchiya, Hajime Nakanotani, Chihaya Adachi
ADVANCED OPTICAL MATERIALS, 10, 17, Sep. 2022, [Peer-reviewed]
English, Scientific journal - An Overlooked Charge-Transfer Interaction in the Interfacial Triplet-Triplet Upconversion Process in Blue Organic Light-Emitting Diodes
Thanh Ba Nguyen, Hajime Nakanotani, Chihaya Adachi
ADVANCED OPTICAL MATERIALS, 10, 18, Sep. 2022, [Peer-reviewed], [Corresponding author]
English, Scientific journal - Highly Efficient Deep-Blue Organic Light-Emitting Diodes Based on Rational Molecular Design and Device Engineering
Masashi Mamada, Hiroshi Katagiri, Chin-Yiu Chan, Yi-Ting Lee, Kenichi Goushi, Hajime Nakanotani, Takuji Hatakeyama, Chihaya Adachi
ADVANCED FUNCTIONAL MATERIALS, 32, 32, Aug. 2022, [Peer-reviewed]
English, Scientific journal - Carbazole-2-carbonitrile as an acceptor in deep-blue thermally activated delayed fluorescence emitters for narrowing charge-transfer emissions
Chin-Yiu Chan, Yi-Ting Lee, Masashi Mamada, Kenichi Goushi, Youichi Tsuchiya, Hajime Nakanotani, Chihaya Adachi
CHEMICAL SCIENCE, 13, 26, 7821, 7828, Jul. 2022, [Peer-reviewed]
English, Scientific journal - Spontaneous formation of metastable orientation with well-organized permanent dipole moment in organic glassy films
Masaki Tanaka, Morgan Auffray, Hajime Nakanotani, Chihaya Adachi
NATURE MATERIALS, 21, 7, 819, +, Jul. 2022, [Peer-reviewed], [Corresponding author]
English, Scientific journal - Significant role of triplet spin state for exciton dissociation in organic solids
Takahiko Yamanaka, Hajime Nakanotani, Chihaya Adachi
Science Advances, 8, 9, Mar. 2022, [Peer-reviewed], [Corresponding author]
English, Scientific journal - Very low lasing threshold of DABNA derivatives with DFB structures
Masashi Mamada, Satoshi Maedera, Susumu Oda, Thanh Ba Nguyen, Hajime Nakanotani, Takuji Hatakeyama, Chihaya Adachi
Materials Chemistry Frontiers, Royal Society of Chemistry (RSC), 2022, [Peer-reviewed]
Scientific journal, For elucidating the potential of light amplification properties of thermally activated delayed fluorescence materials (TADF), the distributed feedback (DFB) laser devices using DABNA derivatives having a multiple-resonance effect were fabricated.... - Efficiency of Thermally Activated Delayed Fluorescence Sensitized Triplet Upconversion Doubled in Three-Component System
Brett Yurash, Alana Dixon, Carolina Espinoza, Alexander Mikhailovsky, Sangmin Chae, Hajime Nakanotani, Chihaya Adachi, Thuc-Quyen Nguyen
Advanced Materials, 34, 5, 2103976, Nov. 2021, [Peer-reviewed]
English, Scientific journal - 2,6-Dicarbonitrile Diphenyl-1 lambda(5)-Phosphinine (DCNP)-A Robust Conjugated Building Block for Multi-Functional Dyes Exhibiting Tunable Amplified Spontaneous Emission
Umamahesh Balijapalli, Xun Tang, Daichi Okada, Yi-Ting Lee, Buddhika S. B. Karunathilaka, Morgan Auffray, Ganbaatar Tumen-Ulzii, Youichi Tsuchiya, Atula S. D. Sandanayaka, Toshinori Matsushima, Hajime Nakanotani, Chihaya Adachi
ADVANCED OPTICAL MATERIALS, 9, 21, Nov. 2021, [Peer-reviewed]
English, Scientific journal - Tetrabenzo[a,c]phenazine Backbone for Highly Efficient Orange–Red Thermally Activated Delayed Fluorescence with Completely Horizontal Molecular Orientation
Umamahesh Balijapalli, Yi‐Ting Lee, Buddhika S. B. Karunathilaka, Ganbaatar Tumen‐Ulzii, Morgan Auffray, Youichi Tsuchiya, Hajime Nakanotani, Chihaya Adachi
Angewandte Chemie International Edition, 60, 35, 19364, 19373, 23 Aug. 2021, [Peer-reviewed]
Scientific journal - Direct Observation of Photoexcited Electron Dynamics in Organic Solids Exhibiting Thermally Activated Delayed Fluorescence via Time-Resolved Photoelectron Emission Microscopy
Yusuke Fukami, Masato Iwasawa, Masahiro Sasaki, Takuya Hosokai, Hajime Nakanotani, Chihaya Adachi, Keiki Fukumoto, Yoichi Yamada
Advanced Optical Materials, 9, 19, 2100619, Jun. 2021, [Peer-reviewed]
Scientific journal - Highly Efficient Near‐Infrared Electrofluorescence from a Thermally Activated Delayed Fluorescence Molecule
Umamahesh Balijapalli, Ryo Nagata, Nishiki Yamada, Hajime Nakanotani, Masaki Tanaka, Anthony D'Aléo, Virginie Placide, Masashi Mamada, Youichi Tsuchiya, Chihaya Adachi
Angewandte Chemie, 133, 15, 8558, 8563, Wiley, 06 Apr. 2021
Scientific journal - Highly Efficient Near‐Infrared Electrofluorescence from a Thermally Activated Delayed Fluorescence Molecule
Umamahesh Balijapalli, Ryo Nagata, Nishiki Yamada, Hajime Nakanotani, Masaki Tanaka, Anthony D'Aléo, Virginie Placide, Masashi Mamada, Youichi Tsuchiya, Chihaya Adachi
Angewandte Chemie International Edition, 60, 15, 8477, 8482, Wiley, 06 Apr. 2021, [Peer-reviewed], [Corresponding author]
Scientific journal - Amplified spontaneous emission from oligo(p-phenylenevinylene) derivatives
Masashi Mamada, Hajime Nakanotani, Chihaya Adachi
Materials Advances, 2, 3906, 3914, Royal Society of Chemistry ({RSC}), Apr. 2021, [Peer-reviewed]
Scientific journal - Investigating HOMO Energy Levels of Terminal Emitters for Realizing High‐Brightness and Stable TADF‐Assisted Fluorescence Organic Light‐Emitting Diodes
Yi‐Ting Lee, Chin‐Yiu Chan, Masaki Tanaka, Masashi Mamada, Umamahesh Balijapalli, Youichi Tsuchiya, Hajime Nakanotani, Takuji Hatakeyama, Chihaya Adachi
Advanced Electronic Materials, 7, 4, 2001090, 2001090, Wiley, Apr. 2021, [Peer-reviewed]
Scientific journal - Author Correction: Stable pure-blue hyperfluorescence organic light-emitting diodes with high-efficiency and narrow emission
Chin-Yiu Chan, Masaki Tanaka, Yi-Ting Lee, Yiu-Wing Wong, Hajime Nakanotani, Takuji Hatakeyama, Chihaya Adachi
Nature Photonics, 15, 3, 245, 245, Springer Science and Business Media {LLC}, 12 Mar. 2021
Scientific journal - Stable pure-blue hyperfluorescence organic light-emitting diodes with high-efficiency and narrow emission
Chin-Yiu Chan, Masaki Tanaka, Yi-Ting Lee, Yiu-Wing Wong, Hajime Nakanotani, Takuji Hatakeyama, Chihaya Adachi
Nature Photonics, 15, 3, 203, 207, Springer Science and Business Media {LLC}, 04 Mar. 2021, [Peer-reviewed]
Scientific journal - Thermally Activated Delayed Fluorescence Properties of Trioxoazatriangulene Derivatives Modified with Electron Donating Groups
Youichi Tsuchiya, Yuma Ishikawa, Sang‐Hoon Lee, Xian‐Kai Chen, Jean‐Luc Brédas, Hajime Nakanotani, Chihaya Adachi
Advanced Optical Materials, 9, 14, 2002174, 2002174, 03 Mar. 2021, [Peer-reviewed]
English, Scientific journal - Isotope Effect of Host Material on Device Stability of Thermally Activated Delayed Fluorescence Organic Light‐Emitting Diodes
Xuelong Liu, Chin-Yiu Chan, Fabrice Mathevet, Masashi Mamada, Youichi Tsuchiya, Yi-Ting Lee, Hajime Nakanotani, Shinichiro Kobayashi, Masayuki Shiochi, Chihaya Adachi
Small Science, 1, 4, 2000057, 2000057, Wiley, 07 Feb. 2021, [Peer-reviewed]
Scientific journal - Thermally-activated delayed fluorescence for light-emitting devices
Hajime Nakanotani, Youichi Tsuchiya, Chihaya Adachi
Chemistry Letters, The Chemical Society of Japan, 26 Jan. 2021, [Peer-reviewed], [Invited], [Lead author, Corresponding author]
Scientific journal - Stable pure-blue hyperfluorescence OLEDs
Chin-Yiu Chan, Yi-Ting Lee, Masaki Tanaka, Yiu-Wing Wong, Hajime Nakanotani, Chihaya Adachi
Proceedings of SPIE - The International Society for Optical Engineering, 11808, SPIE, 2021
English, International conference proceedings - Understanding degradation of organic light-emitting diodes from magnetic field effects
Masaki Tanaka, Ryo Nagata, Hajime Nakanotani, Chihaya Adachi
Communications Materials, 1, 1, Dec. 2020, [Peer-reviewed], [Corresponding author]
English, Scientific journal - H2O-Induced Crystallization of Organic Luminescent Thin Films by Direct Film Storage in a High Vacuum
Takuya Hosokai, Taiyo Nakanishi, Akinori Honda, Kouki Akaike, Ryohei Tsuruta, Hiroshi Itoh, Hajime Nakanotani, Yasuo Nakayama
The Journal of Physical Chemistry C, 124, 45, 24919, 24929, American Chemical Society (ACS), 12 Nov. 2020, [Peer-reviewed]
Scientific journal - Precise Exciton Management of Quaternary Emission Layers for Highly Stable Organic Light-Emitting Diodes Based on Thermally Activated Delayed Fluorescence
Masaki Tanaka, Ryo Nagata, Hajime Nakanotani, Chihaya Adachi
ACS Applied Materials & Interfaces, 12, 45, 50668, 50674, 11 Nov. 2020, [Peer-reviewed], [Corresponding author]
English, Scientific journal - Partial Modification of Electron-withdrawing Groups in Thermally-activated Delayed Fluorescence Materials Aimed to Improve Efficiency and Stability
Masayuki Yokoyama, Youichi Tsuchiya, Hajime Nakanotani, Chihaya Adachi
Chemistry Letters, 49, 10, 1189, 1193, 05 Oct. 2020, [Peer-reviewed]
English, Scientific journal - Fast spin-flip enables efficient and stable organic electroluminescence from charge-transfer states
Lin Song Cui, Alexander J. Gillett, Shou Feng Zhang, Hao Ye, Yuan Liu, Xian Kai Chen, Ze Sen Lin, Emrys W. Evans, William K. Myers, Tanya K. Ronson, Hajime Nakanotani, Sebastian Reineke, Jean Luc Bredas, Chihaya Adachi, Richard H. Friend
Nature Photonics, 14, 10, 636, 642, Springer Science and Business Media LLC, Oct. 2020, [Peer-reviewed], [International Magazine]
English, Scientific journal - Role of Spontaneous Orientational Polarization in Organic Donor-Acceptor Blends for Exciton Binding
Yuuhi Ueda, Hajime Nakanotani, Takuya Hosokai, Yuya Tanaka, Hokuto Hamada, Hisao Ishii, Shuhei Santo, Chihaya Adachi
ADVANCED OPTICAL MATERIALS, 8, 21, Sep. 2020, [Peer-reviewed], [Corresponding author]
English, Scientific journal - Near-infrared absorbing pyrrolopyrrole aza-BODIPY-based donor-acceptor polymers with reasonable photoresponse
Ru Feng, Narumi Sato, Mayuka Nomura, Akinori Saeki, Hajime Nakanotani, Chihaya Adachi, Takuma Yasuda, Hiroyuki Furuta, Soji Shimizu
Journal of Materials Chemistry C, 8, 26, 8770, 8776, Jul. 2020, [Peer-reviewed]
English, Scientific journal - Molecular Design Based on Donor-Weak Donor Scaffold for Blue Thermally-Activated Delayed Fluorescence Designed by Combinatorial DFT Calculations
Youichi Tsuchiya, Keita Tsuji, Ko Inada, Fatima Bencheikh, Yan Geng, H. Shaun Kwak, Thomas J.L. Mustard, Mathew D. Halls, Hajime Nakanotani, Chihaya Adachi
Frontiers in Chemistry, 8, May 2020, [Peer-reviewed]
English, Scientific journal - Nanosecond-time-scale delayed fluorescence molecule for deep-blue OLEDs with small efficiency rolloff
Jong Uk Kim, In Seob Park, Chin-Yiu Chan, Masaki Tanaka, Youichi Tsuchiya, Hajime Nakanotani, Chihaya Adachi
Nature Communications, 11, 1, 14 Apr. 2020, [Peer-reviewed], [International Magazine]
English, Scientific journal - Temperature dependence of intersystem crossing rate of thermally activated delayed fluorescence emitters
Kayamyo Atsumi, Ishii Tomoya, Kobayashi Takashi, Nagase Takashi, Nakanotani Hajime, Goushi Kenichi, Adachi Chihaya, Naito Hiroyoshi
JSAP Annual Meetings Extended Abstracts, 2020.1, 2320, 2320, The Japan Society of Applied Physics, 28 Feb. 2020
Japanese - Utilization of Multi-Heterodonors in Thermally Activated Delayed Fluorescence Molecules and Their High Performance Bluish-Green Organic Light-Emitting Diodes
Umamahesh Balijapalli, Masaki Tanaka, Morgan Auffray, Chin-Yiu Chan, Yi-Ting Lee, Youichi Tsuchiya, Hajime Nakanotani, Chihaya Adachi
ACS Applied Materials & Interfaces, 12, 8, 9498, 9506, American Chemical Society ({ACS}), 26 Feb. 2020, [Peer-reviewed], [International Magazine]
English, Scientific journal - The Role of Reverse Intersystem Crossing Using a TADF-Type Acceptor Molecule on the Device Stability of Exciplex-Based Organic Light-Emitting Diodes
Thanh Ba Nguyen, Hajime Nakanotani, Takuji Hatakeyama, Chihaya Adachi
Advanced Materials, 32, 9, Jan. 2020, [Peer-reviewed], [Corresponding author], [International Magazine]
English, Scientific journal - Molecular orientation of disk-shaped small molecules exhibiting thermally activated delayed fluorescence in host-guest films
Masaki Tanaka, Hiroki Noda, Hajime Nakanotani, Chihaya Adachi
Applied Physics Letters, 116, 2, Jan. 2020, [Peer-reviewed], [Corresponding author], [International Magazine]
English, Scientific journal - Observation of Nonradiative Deactivation Behavior from Singlet and Triplet States of Thermally Activated Delayed Fluorescence Emitters in Solution
Naoto Notsuka, Hajime Nakanotani, Hiroki Noda, Kenichi Goushi, Chihaya Adachi
JOURNAL OF PHYSICAL CHEMISTRY LETTERS, 11, 2, 562, 566, Jan. 2020, [Peer-reviewed], [International Magazine]
English, Scientific journal - Slow recombination of spontaneously dissociated organic fluorophore excitons
Takahiko Yamanaka, Hajime Nakanotani, Chihaya Adachi
Nature communications, 10, 1, Dec. 2019, [Peer-reviewed], [International Magazine]
English, Scientific journal - Critical role of intermediate electronic states for spin-flip processes in charge-transfer-type organic molecules with multiple donors and acceptors
Hiroki Noda, Xian-Kai Chen, Hajime Nakanotani, Takuya Hosokai, Momoka Miyajima, Naoto Notsuka, Yuuki Kashima, Jean-Luc Bredas, Chihaya Adachi
NATURE MATERIALS, 18, 10, 1084, +, Oct. 2019, [Peer-reviewed], [Corresponding author], [International Magazine]
English, Scientific journal - TADF activation by solvent freezing The role of nonradiative triplet decay and spin-orbit coupling in carbazole benzonitrile derivatives
T. Hosokai, Hajime Nakanotani, S. Santou, H. Noda, Y. Nakayama, Chihaya Adachi
Synthetic Metals, 252, 62, 68, Jun. 2019, [Peer-reviewed]
English, Scientific journal - Suppression of Structural Change upon S-1-T-1 Conversion Assists the Thermally Activated Delayed Fluorescence Process in Carbazole-Benzonitrile Derivatives
Saigo Masaki, Miyata Kiyoshi, Tanaka Sei'ichi, Nakanotani Hajime, Adachi Chihaya, Onda Ken
JOURNAL OF PHYSICAL CHEMISTRY LETTERS, 10, 10, 2475, 2480, 16 May 2019, [Peer-reviewed]
English, Scientific journal - Effect of Carrier Balance on Device Degradation of Organic Light-Emitting Diodes Based on Thermally Activated Delayed Fluorescence Emitters
Masaki Tanaka, Hiroki Noda, Hajime Nakanotani, Chihaya Adachi
Advanced Electronic Materials, 5, 5, May 2019, [Peer-reviewed]
English, Scientific journal - Photoluminescence Quenching Probes Spin Conversion and Exciton Dynamics in Thermally Activated Delayed Fluorescence Materials
Brett Yurash, Hajime Nakanotani, Yoann Olivier, David Beljonne, Chihaya Adachi, Thuc Quyen Nguyen
Advanced Materials, 31, 21, May 2019, [Peer-reviewed]
English, Scientific journal - Photoluminescence properties of bromine-substituted thermally activated delayed fluorescence emitters
Ishii Tomoya, Kawate Daisuke, Kobayashi Takashi, Nagase Takashi, Goushi Kenichi, Hajime Nakanotani, Adachi Chihaya, Naito Hiroyoshi
JSAP Annual Meetings Extended Abstracts, 2019.1, 2355, 2355, The Japan Society of Applied Physics, 25 Feb. 2019
Japanese - Highly Efficient Thermally Activated Delayed Fluorescence with Slow Reverse Intersystem Crossing
Hiroki Noda, Hajime Nakanotani, Chihaya Adachi
CHEMISTRY LETTERS, 48, 2, 126, 129, Feb. 2019, [Peer-reviewed], [Corresponding author]
English, Scientific journal - Analysis method for dynamics of exciton in organic light-emitting diodes based on thermally activated delayed fluorescence emitters: Magnetic field effect as footprint of exciton
Masaki Tanaka, Ryo Nagata, Hajime Nakanotani, Chihaya Adachi
Proceedings of the International Display Workshops, 2, 809, 811, International Display Workshops, 2019
English, International conference proceedings - High-triplet-energy Bipolar Host Materials Based on Phosphine Oxide Derivatives for Efficient Sky-blue Thermally Activated Delayed Fluorescence Organic Light-emitting Diodes with Reduced Roll-off
Jong Uk Kim, Michael Y. Wong, Shiv Kumar, Oliver G. Hayes, Finlay Duncan, Chin Yiu Chan, Ben Yiu Wing Wong, Hao Ye, Lin Song Cui, Hajime Nakanotani, Eli Zysman-Colman, Chihaya Adachi
Chemistry Letters, 48, 10, 1225, 1228, Jan. 2019, [Peer-reviewed]
English, We designed and synthesized two new ambipolar host materials, namely CzPO and Cz3PO. Combining CzPO and Cz3PO with CzTRZ2 as the emitter resulted in improved maximum external quantum efficiencies of 13.1% and 13.2%, respectively, together with small efficiency roll-offs, while the device based on bis[2-(diphenylphosphino)phenyl]ether oxide (DPEPO) as host showed a much more pronounced efficiency roll-off. - Photostable and highly emissive glassy organic dots exhibiting thermally activated delayed fluorescence
Tsuchiya Y, Ikesue K, Nakanotani H, Adachi C
Chemical Communications, 55, 36, 5215, 5218, 2019, [Peer-reviewed]
English, Scientific journal - Efficient and stable sky-blue delayed fluorescence organic light-emitting diodes with CIE
y below 0.4
Chan, C.-Y., Tanaka, M., Nakanotani, H., Adachi, C.
Nature Communications, 9, 1, Dec. 2018, [Peer-reviewed]
English, Scientific journal - The Importance of Excited-State Energy Alignment for Efficient Exciplex Systems Based on a Study of Phenylpyridinato Boron Derivatives
Mamada, M., Tian, G., Nakanotani, H., Su, J., Adachi, C.
Angewandte Chemie - International Edition, 57, 38, 12380, 12384, 17 Sep. 2018, [Peer-reviewed]
Scientific journal - Exploiting Singlet Fission in Organic Light-Emitting Diodes
Nagata, R., Nakanotani, H., Potscavage, W.J., Adachi, C.
Advanced Materials, 30, 33, 16 Aug. 2018, [Peer-reviewed]
Scientific journal - Trifluoromethane modification of thermally activated delayed fluorescence molecules for high-efficiency blue organic light-emitting diodes
Yokoyama Masayuki, Inada Ko, Tsuchiya Youichi, Nakanotani Hajime, Adachi Chihaya
CHEMICAL COMMUNICATIONS, 54, 59, 8261, 8264, 28 Jul. 2018, [Peer-reviewed]
English, Scientific journal - Well-ordered films of disk-shaped thermally activated delayed fluorescence (TADF) molecules
Hasegawa, Yuri, Minami, Hayato, Kanada, Satoru, Yamada, Yoichi, Sasaki, Masahiro, Hosokai, Takuya, Nakanotani, Hajime, Adachi, Chihaya
JOURNAL OF PHOTONICS FOR ENERGY, 8, 3, 032110, Jul. 2018, [Peer-reviewed]
English, Scientific journal - Excited state engineering for efficient reverse intersystem crossing
Hiroki Noda, Hajime Nakanotani, Chihaya Adachi
SCIENCE ADVANCES, 4, 6, eaao6910, Jun. 2018, [Peer-reviewed]
English, Scientific journal - Rational Molecular Design for Deep-Blue Thermally Activated Delayed Fluorescence Emitters
Chan, C.-Y., Cui, L.-S., Kim, J.U., Nakanotani, H., Adachi, C.
Advanced Functional Materials, 28, 11, 14 Mar. 2018, [Peer-reviewed]
Scientific journal - Solvent-dependent investigation of carbazole benzonitrile derivatives: Does the le 3 - CT 1 energy gap facilitate thermally activated delayed fluorescence?
Hosokai T, Noda H, Nakanotani H, Nawata T, Nakayama Y, Matsuzaki H, Adachi C
Journal of Photonics for Energy, 8, 3, 2018, [Peer-reviewed]
English, Scientific journal - Well-Ordered 4CzIPN ((4s,6s)-2,4,5,6-Tetra(9-H-carbazol-9-yl)isophthalonitrile) Layers: Molecular Orientation, Electronic Structure, and Angular Distribution of Photoluminescence
Hasegawa, Y., Yamada, Y., Sasaki, M., Hosokai, T., Nakanotani, H., Adachi, C.
Journal of Physical Chemistry Letters, 9, 4, 863, 867, 2018, [Peer-reviewed]
Scientific journal - Donor-sigma-Acceptor Motifs: Thermally Activated Delayed Fluorescence Emitters with Dual Upconversion
Yan Geng, Anthony D'Aleo, Ko Inada, Lin-Song Cui, Jong Uk Kim, Hajime Nakanotani, Chihaya Adachi
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION, 56, 52, 16536, 16540, Dec. 2017, [Peer-reviewed]
English, Scientific journal - Long-lived efficient delayed fluorescence organic light-emitting diodes using n-type hosts
Lin-Song Cui, Shi-Bin Ruan, Fatima Bencheikh, Ryo Nagata, Lei Zhang, Ko Inada, Hajime Nakanotani, Liang-Sheng Liao, Chihaya Adachi
NATURE COMMUNICATIONS, 8, Dec. 2017, [Peer-reviewed]
English, Scientific journal - Molecular Design for Blue Thermal Activated Delayed Fluorescence Materials: Substitution Position Effect
Yan Geng, Lin-Song Cui, Jong Uk Kim, Hajime Nakanotani, Chihaya Adachi
CHEMISTRY LETTERS, 46, 10, 1490, 1492, Oct. 2017, [Peer-reviewed]
English, Scientific journal - Thermally activated delayed fluorescence of Bis(9,9-dimethy1-9,10-dihydroacridine) dibenzo [b,d]thiophene 5,5-dioxide derivatives for organic light-emitting diodes
Jong Uk Kim, Saripally Sudhaker Reddy, Lin-Song Cui, Hiroko Nomura, Sunbin Hwang, Dae Hyeon Kim, Hajime Nakanotani, Sung-Ho Jin, Chihaya Adachi
JOURNAL OF LUMINESCENCE, 190, 485, 491, Oct. 2017, [Peer-reviewed]
English, Scientific journal - Near-infrared organic light-emitting diodes for biosensing with high operating stability
Takahiko Yamanaka, Hajime Nakanotani, Shigeo Hara, Toru Hirohata, Chihaya Adachi
APPLIED PHYSICS EXPRESS, 10, 7, Jul. 2017, [Peer-reviewed]
English, Scientific journal - Highly Efficient Thermally Activated Delayed Fluorescence from an Excited-State Intramolecular Proton Transfer System
Masashi Mamada, Ko Inada, Takeshi Komino, William J. Potscavage, Hajime Nakanotani, Chihaya Adachi
ACS CENTRAL SCIENCE, 3, 7, 769, 777, Jul. 2017, [Peer-reviewed]
English, Scientific journal - Light Amplification in Molecules Exhibiting Thermally Activated Delayed Fluorescence
Hajime Nakanotani, Taro Furukawa, Takuya Hosokai, Takuji Hatakeyama, Chihaya Adachi
ADVANCED OPTICAL MATERIALS, 5, 12, 1700051, 1700051, Jun. 2017, [Peer-reviewed]
English, Scientific journal - Evidence and mechanism of efficient thermally activated delayed fluorescence promoted by delocalized excited states
Takuya Hosokai, Hiroyuki Matsuzaki, Hajime Nakanotani, Katsumi Tokumaru, Tetsuo Tsutsui, Akihiro Furube, Keirou Nasu, Hiroko Nomura, Masayuki Yahiro, Chihaya Adachi
SCIENCE ADVANCES, 3, 5, May 2017, [Peer-reviewed]
English, Scientific journal - Near-Infrared Electrophosphorescence up to 1.1 mu m using a Thermally Activated Delayed Fluorescence Molecule as Triplet Sensitizer
Ryo Nagata, Hajime Nakanotani, Chihaya Adachi
ADVANCED MATERIALS, 29, 5, Feb. 2017, [Peer-reviewed]
English, Scientific journal - Controlling Singlet-Triplet Energy Splitting for Deep-Blue Thermally Activated Delayed Fluorescence Emitters
Lin-Song Cui, Hiroko Nomura, Yan Geng, Jong Uk Kim, Hajime Nakanotani, Chihaya Adachi
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION, 56, 6, 1571, 1575, Feb. 2017, [Peer-reviewed]
English, Scientific journal - Current understanding of mechanism of thermally activated delayed fluorescence: RISC beyond S-T energy gap
Takuya Hosokai, Hiroyuki Matsuzaki, Hajime Nakanotani, Chihaya Adachi
Proceedings of the International Display Workshops, 1, 690, 693, 2017
International conference proceedings - Controled molecular orientation and photoluminescence measurement in TADF molecular thin film
Minami Hayato, Sasaki Masahiro, Yamada Yoichi, Hosokai Takuya, Nakanotani Hajime, Adachi Chihaya, Hasegawa Yuri
Abstract of annual meeting of the Surface Science of Japan, 37, 0, 212, 212, The Surface Science Society of Japan, 2017
Japanese, 熱活性遅延蛍光分子は、緻密な分子設計によって内部量子効率100%を実現することが知られている。高効率の有機ELデバイス実現のためには、高い内部量子効率の維持が重要であると考える。我々は金属基板上でいくつかのTADF分子について高配向の単分子膜を形成し、STMにより構造解析を行った。また、過渡発光計測の結果、TADF分子の一種である4CzIPNは遅延蛍光の発光効率が膜厚に依存することを見出した。 - Well ordered TADF molecular layers and their electronic structure
Yamada,Yoichi, Hasegawa,Yuri, Hosikai,Takuya, Nakanotani,Hajime, Adachi,Chihaya, Enrique,Ortega
Abstract of annual meeting of the Surface Science of Japan, 37, 0, 3, 3, The Surface Science Society of Japan, 2017
Japanese, Scientific journal, 熱活性型遅延蛍光(TADF)は、三重項励起子を熱励起により一重項励起子に逆項間交差させることで、内部量子効率100%の蛍光発光を可能にする。この分子を用いたデバイスの外部量子効率を向上させるため、配向制御により遷移双極子モーメントを揃えることで、光取出効率を向上させることが重要である。我々は、この分子の配向制御を達成し、さらに配向膜の電子状態が孤立分子と同様であることを示した。 - Application of wide-energy-gap material 3,4-di(9H-carbazol-9-yl)benzonitrile in organic light-emitting diodes
Yuya Tanaka, Takehiro Takahashi, Junichi Nishide, Yasuhide Hiraga, Hajime Nakanotani, Chihaya Adachi
THIN SOLID FILMS, 619, 120, 124, Nov. 2016, [Peer-reviewed]
English, Scientific journal - Tunable OLEDs: Color Tuning of Avobenzone Boron Difluoride as an Emitter to Achieve Full-Color Emission (Adv. Funct. Mater. 37/2016)
Hin-Wai Mo, Youichi Tsuchiya, Yan Geng, Takehiro Sagawa, Chika Kikuchi, Hajime Nakanotani, Fuyuki Ito, Chihaya Adachi
Advanced Functional Materials, 26, 37, 6847, Wiley-VCH Verlag, 04 Oct. 2016, [Peer-reviewed]
English - Boron Difluoride Complexes of Expanded N‐Confused Calix[ n ]phyrins That Demonstrate Unique Luminescent and Lasing Properties
Masatoshi Ishida, Toshihiro Omagari, Ryuji Hirosawa, Keisuke Jono, Young Mo Sung, Yuhsuke Yasutake, Hidemitsu Uno, Motoki Toganoh, Hajime Nakanotani, Susumu Fukatsu, Dongho Kim, Hiroyuki Furuta
Angewandte Chemie, 128, 39, 12224, 12228, Wiley, 19 Sep. 2016
English, Scientific journal - Corrigendum to: Benzimidazobenzothiazole-based Bipolar Hosts to Harvest Nearly All of the Excitons from Blue Delayed Fluorescence and Phosphorescent Organic Light-Emitting Diodes (Angew. Chem. Int. Ed., (2016), 55, (6864-6868) 10.1002/anie.201601136)
Cui, L.-S., Kim, J.U., Nomura, H., Nakanotani, H., Adachi, C.
Angewandte Chemie - International Edition, 55, 40, 12136, 12136, Sep. 2016, [Peer-reviewed]
Scientific journal - Magnesium-gold binary alloy for organic light-emitting diodes with high corrosion resistance
Hiroya Arai, Hajime Nakanotani, Kei Morimoto, Chihaya Adachi
Journal of Vacuum Science and Technology B: Nanotechnology and Microelectronics, 34, 4, American Institute of Physics Inc., 01 Jul. 2016, [Peer-reviewed]
English, Scientific journal - Magnesium-gold binary alloy for organic light-emitting diodes with high corrosion resistance
Hiroya Arai, Hajime Nakanotani, Kei Morimoto, Chihaya Adachi
JOURNAL OF VACUUM SCIENCE & TECHNOLOGY B, 34, 4, Jul. 2016, [Peer-reviewed]
English, Scientific journal - Thermally Activated Delayed Fluorescence from Pentacarbazorylbenzonitrile
Shuho Tanimoto, Takatsugu Suzuki, Hajime Nakanotani, Chihaya Adachi
CHEMISTRY LETTERS, 45, 7, 770, 772, Jul. 2016, [Peer-reviewed]
English, Scientific journal - Quantification of temperature rise in unipolar organic conductors during short voltage-pulse excitation using electrical testing methods
Kou Yoshida, Toshinori Matsushima, Hajime Nakanotani, Chihaya Adachi
ORGANIC ELECTRONICS, 31, 191, 197, Apr. 2016, [Peer-reviewed]
English, Scientific journal - Effect of Joule heating on transient current and electroluminescence in p-i-n organic light-emitting diodes under pulsed voltage operation
Kou Yoshida, Hajime Nakanotani, Chihaya Adachi
ORGANIC ELECTRONICS, 31, 287, 294, Apr. 2016, [Peer-reviewed]
English, Scientific journal - Benzimidazobenzothiazole-Based Bipolar Hosts to Harvest Nearly All of the Excitons from Blue Delayed Fluorescence and Phosphorescent Organic Light-Emitting Diodes
Cui, L.-S., Kim, J.U., Nomura, H., Nakanotani, H., Adachi, C.
Angewandte Chemie - International Edition, 55, 24, 6864, 6868, Apr. 2016, [Peer-reviewed]
Scientific journal - Low threshold amplified spontaneous emission and ambipolar charge transport in non-volatile liquid fluorene derivatives.
Ribierre JC, Zhao L, Inoue M, Schwartz PO, Kim JH, Yoshida K, Sandanayaka AS, Nakanotani H, Mager L, Méry S, Adachi C
Chemical communications (Cambridge, England), 52, 15, 3103, 3106, Feb. 2016, [Peer-reviewed]
English, Scientific journal - Long-range coupling of electron-hole pairs in spatially separated organic donor-acceptor layers
Hajime Nakanotani, Taro Furukawa, Kei Morimoto, Chihaya Adachi
SCIENCE ADVANCES, 2, 2, e1501470, Feb. 2016, [Peer-reviewed]
English, Scientific journal - Effect of reverse intersystem crossing rate to suppress efficiency roll-off in organic light-emitting diodes with thermally activated delayed fluorescence emitters
Munetomo Inoue, Tomas Serevicius, Hajime Nakanotani, Kou Yoshida, Toshinori Matsushima, Saulius Jursenas, Chihaya Adachi
CHEMICAL PHYSICS LETTERS, 644, 62, 67, Jan. 2016, [Peer-reviewed]
English, Scientific journal - Color Tuning of Avobenzone Boron Difluoride as an Emitter to Achieve Full-Color Emission
Mo, H.-W., Tsuchiya, Y., Geng, Y., Sagawa, T., Kikuchi, C., Nakanotani, H., Ito, F., Adachi, C.
Advanced Functional Materials, 26, 37, 6703, 6710, 2016, [Peer-reviewed]
Scientific journal - Role of intermediate state in the excited state dynamics of highly efficient TADF molecules
Hosokai Takuya, Matsuzaki Hiroyuki, Furube Akihiro, Tokumaru Katsumi, Tsutsui Tetsuo, Nakanotani Hajime, Yahiro Masayuki, Adachi Chihaya
ORGANIC LIGHT EMITTING MATERIALS AND DEVICES XX, 9941, 2016, [Peer-reviewed]
English, International conference proceedings - Boron Difluoride Complexes of Expanded N-Confused Calix[n]phyrins That Demonstrate Unique Luminescent and Lasing Properties
Masatoshi Ishida, Toshihiro Omagari, Ryuji Hirosawa, Keisuke Jono, Young Mo Sung, Yuhsuke Yasutake, Hidemitsu Uno, Motoki Toganoh, Hajime Nakanotani, Susumu Fukatsu, Dongho Kim, Hiroyuki Furuta
Angewandte Chemie - International Edition, 55, 39, 12045, 12049, 2016, [Peer-reviewed]
Scientific journal - Light Amplification in an Organic Solid-State Film with the Aid of Triplet-to-Singlet Upconversion
Hajime Nakanotani, Taro Furukawa, Chihaya Adachi
ADVANCED OPTICAL MATERIALS, 3, 10, 1381, 1388, Oct. 2015, [Peer-reviewed], [Lead author, Corresponding author]
English, Scientific journal - Introduction of oxygen into organic thin films with the aim of suppressing singlet-triplet annihilation
Inoue, M., Matsushima, T., Nakanotani, H., Adachi, C.
Chemical Physics Letters, 624, 43, 46, 16 Mar. 2015, [Peer-reviewed]
Scientific journal - High-Efficiency White Organic Light-Emitting Diodes Based on a Blue Thermally Activated Delayed Fluorescent Emitter Combined with Green and Red Fluorescent Emitters
Higuchi, T., Nakanotani, H., Adachi, C.
Advanced Materials, 27, 12, 2019, 2023, Mar. 2015, [Peer-reviewed]
Scientific journal - Highly efficient blue electroluminescence based on thermally activated delayed fluorescence
Hirata, S., Sakai, Y., Masui, K., Tanaka, H., Lee, S.Y., Nomura, H., Nakamura, N., Yasumatsu, M., Nakanotani, H., Zhang, Q., Shizu, K., Miyazaki, H., Adachi, C.
Nature Materials, 14, 3, 330, 336, Mar. 2015, [Peer-reviewed]
English, Scientific journal - Controlled emission colors and singlet-triplet energy gaps of dihydrophenazine-based thermally activated delayed fluorescence emitters
Lee, J., Shizu, K., Tanaka, H., Nakanotani, H., Yasuda, T., Kaji, H., Adachi, C.
Journal of Materials Chemistry C, 3, 10, 2175, 2181, Mar. 2015, [Peer-reviewed]
English, Scientific journal - Dual enhancement of electroluminescence efficiency and operational stability by rapid upconversion of triplet excitons in OLEDs
Furukawa, T., Nakanotani, H., Inoue, M., Adachi, C.
Scientific Reports, 5, 8429, 8429, 12 Feb. 2015, [Peer-reviewed]
Scientific journal - High-Efficiency Sky-Blue Organic Light-Emitting Diodes Utilizing Thermally-Activated Delayed Fluorescence
Hiraga Yasuhide, Nishide Jun-ichi, Nakanotani Hajime, Aonuma Masaki, Adachi Chihaya
Ieice Transactions on Electronics, E98C, 10, 971, 976, The Institute of Electronics, Information and Communication Engineers, 2015, [Peer-reviewed]
English, A highly efficient sky-blue organic light-emitting diode (OLED) based on a thermally-activated delayed fluorescence (TADF) molecule, 1,2-bis(carbazol-9-yl)-4,5-dicyanobenzene (2CzPN), was studied. The sky-blue OLED exhibited a maximum external electroluminescence quantum efficiency (ηEQE) of over 24.0%. In addition, a white OLED using 2CzPN combined with green and orange TADF emitters showed a high ηEQE of 17.3% with a maximum power efficiency of 52.3 lm/W and Commission Internationale de lEclairage coordinates of (0.32, 0.43). - Suppression of roll-off characteristics of organic light-emitting diodes by narrowing current injection/transport area to 50 nm
Hayashi, K., Nakanotani, H., Inoue, M., Yoshida, K., Mikhnenko, O., Nguyen, T.-Q., Adachi, C.
Applied Physics Letters, 106, 9, 2015, [Peer-reviewed]
Scientific journal - Analysis of alternating current driven electroluminescence in organic light emitting diodes: A comparative study
Le Zhang, Hajime Nakanotani, Kou Yoshida, Chihaya Adachi
ORGANIC ELECTRONICS, 15, 8, 1815, 1821, Aug. 2014, [Peer-reviewed]
English, Scientific journal - Dual Intramolecular Charge-Transfer Fluorescence Derived from a Phenothiazine-Triphenyltriazine Derivative
Hiroyuki Tanaka, Katsuyuki Shizu, Hajime Nakanotani, Chihaya Adachi
JOURNAL OF PHYSICAL CHEMISTRY C, 118, 29, 15985, 15994, Jul. 2014, [Peer-reviewed]
English, Scientific journal - High-efficiency white organic light-emitting diodes using thermally activated delayed fluorescence
Jun-ichi Nishide, Hajime Nakanotani, Yasuhide Hiraga, Chihaya Adachi
APPLIED PHYSICS LETTERS, 104, 23, Jun. 2014, [Peer-reviewed]
English, Scientific journal - High-efficiency organic light-emitting diodes with fluorescent emitters
Hajime Nakanotani, Takahiro Higuchi, Taro Furukawa, Kensuke Masui, Kei Morimoto, Masaki Numata, Hiroyuki Tanaka, Yuta Sagara, Takuma Yasuda, Chihaya Adachi
NATURE COMMUNICATIONS, 5, 4016, 4016, May 2014, [Peer-reviewed]
English, Scientific journal - Promising operational stability of high-efficiency organic light-emitting diodes based on thermally activated delayed fluorescence (vol 3, 2127, 2013)
Hajime Nakanotani, Kensuke Masui, Junichi Nishide, Takumi Shibata, Chihaya Adachi
SCIENTIFIC REPORTS, 4, Jan. 2014, [Peer-reviewed]
English - High Efficiency Fluorescence OLED by Utilizing a TADF Process
Nakanotani Hajime, Adachi Chihaya
Journal of The Society of Photographic Science and Technology of Japan, 77, 4, 296, 300, THE SOCIETY OF PHOTOGRAPHY AND IMAGING OF JAPAN, 2014
Japanese,We report fluorescence-based organic light-emitting diodes (OLEDs) that realize external EL quantum efficiencies approaching to nearly 20% for blue, green, yellow and red emissions, indicating that the singlet exciton production efficiency reached nearly 100%. The high performance is enabled by utilization of thermally activated delayed fluorescence (TADF) molecules as energy donor that permit efficient transfer of all electrically generated singlet and triplet excitons from the energy donor to the conventional fluorescent emitters, i.e., energy acceptor. We revealed that the OLEDs employing this exciton harvesting process also provide significant enhancement of operational stability.
- Light-emitting organic field-effect transistors based on highly luminescent single crystals of thiophene/phenylene co-oligomers
Takahiro Komori, Hajime Nakanotani, Takuma Yasuda, Chihaya Adachi
JOURNAL OF MATERIALS CHEMISTRY C, 2, 25, 4918, 4921, 2014, [Peer-reviewed]
English, Scientific journal - Multi-color light-emitting transistors composed of organic single crystals
Yomogida Yohei, Sakai Hayato, Sawabe Kosuke, Gocho Shota, Bisri Satria Zulkarnaen, Nakanotani Hajime, Adachi Chihaya, Hasobe Taku, Iwasa Yoshihiro, Takenobu Taishi
ORGANIC ELECTRONICS, 14, 11, 2737, 2742, Nov. 2013, [Peer-reviewed]
English, Scientific journal - Promising operational stability of high-efficiency organic light-emitting diodes based on thermally activated delayed fluorescence
Hajime Nakanotani, Kensuke Masui, Junichi Nishide, Takumi Shibata, Chihaya Adachi
SCIENTIFIC REPORTS, 3, 2127, 2127, Jul. 2013, [Peer-reviewed]
English, Scientific journal - Amplified Spontaneous Emission and Electroluminescence from Thiophene/Phenylene Co-Oligomer-Doped p-bis(p-Styrylstyryl)Benzene Crystals
Hajime Nakanotani, Chihaya Adachi
ADVANCED OPTICAL MATERIALS, 1, 6, 422, 427, Jun. 2013, [Peer-reviewed]
English, Scientific journal - Light-Emitting Organic Crystal Field-Effect Transistors for Future Organic Injection Lasers
Hajime Nakanotani, Chihaya Adachi
Physics of Organic Semiconductors: Second Edition, 603, 621, Wiley-VCH, 29 Jan. 2013, [Peer-reviewed]
English, In book - Analysis of exciton annihilation in high-efficiency sky-blue organic light-emitting diodes with thermally activated delayed fluorescence
Masui, K., Nakanotani, H., Adachi, C.
Organic Electronics: physics, materials, applications, 14, 11, 2721, 2726, 2013, [Peer-reviewed]
Scientific journal - Capacitance-voltage characteristics of a 4,4 '-bis[ (N-carbazole)styryl]biphenyl based organic light-emitting diode: Implications for characteristic times and their distribution
Zhang Le, Nakanotani Hajime, Adachi Chihaya
Applied Physics Letters, 103, 9, 2013, [Peer-reviewed]
English, Scientific journal - Twisted Intramolecular Charge Transfer State for Long-Wavelength Thermally Activated Delayed Fluorescence
Tanaka Hiroyuki, Shizu Katsuyuki, Nakanotani Hajime, Adachi Chihaya
Chemistry of Materials, 25, 18, 3766, 3771, 2013, [Peer-reviewed]
English, Scientific journal - Formation of Organic Crystalline Nanopillar Arrays and Their Application to Organic Photovoltaic Cells
Masaya Hirade, Hajime Nakanotani, Masayuki Yahiro, Chihaya Adachi
Appl. Mat. Int., 3, 1, 80, 83, Jan. 2011, [Peer-reviewed] - Highly conductive interface between a rubrene single crystal and a molybdenum oxide layer and its application in transistors
Nakanotani, H., Kakizoe, H., Adachi, C.
Solid State Communications, 151, 1, 93, 96, 2011, [Peer-reviewed]
Scientific journal - Photophysical characteristics of 4,4’-bis(N-carbazolyl)tolan derivatives and their application in organic light emitting diodes
Masakazu Ohkita, Ayataka Endo, Kimihiro Sumiya, Hajime Nakanotani, Takanori Suzuki, Chihaya Adachi
J. Luminescence, 131, 7, 1520, 1524, 2011, [Peer-reviewed]
English, Scientific journal - Emission color tuning in ambipolar organic singlecrystal field-effect transistors by dye-doping
Nakanotani, H., Saito, M., Nakamura, H., Adachi, C.
Advanced Functional Materials, 20, 10, 1610, 1615, 2010, [Peer-reviewed]
Scientific journal - Organic light-emitting diodes containing multilayers of organic single crystals
Nakanotani, H., Adachi, C.
Applied Physics Letters, 96, 5, 2010, [Peer-reviewed]
Scientific journal - Highly balanced ambipolar mobilities with intense electroluminescence in field-effect transistors based on organic single crystal oligo(p-phenylenevinylene) derivatives
Hajime Nakanotani, Masatoshi Saito, Hiroaki Nakamura, Chihaya Adachi
APPLIED PHYSICS LETTERS, 95, 3, Jul. 2009, [Peer-reviewed]
English, Scientific journal - Organic light-emitting devices using organic thin-film single crystals
Nakanotani Hajime, Adachi Chihaya, GALAAD EDIZONI
Eurodisplay 2009, 50, 51, 2009, [Peer-reviewed] - Tuning of threshold voltage by interfacial carrier doping in organic single crystal ambipolar light-emitting transistors and their bright electroluminescence
Nakanotani Hajime, Saito Masatoshi, Nakamura Hiroaki, Adachi Chihaya
Applied Physics Letters, 95, 10, 2009, [Peer-reviewed] - Low threshold blue emission from first-order organic DFB laser using 2,7-bis[4-(N-carbazole)phenylvinyl]-9,9'-spirobifluorene as active gain medium
Masaya Hirade, Hajime Nakanotani, Reiji Hattori, Akihiro Ikeda, Masayuki Yahiro, Chihaya Adachi
Mol. Cryst. Liq. Cryst., 504, 1, 8, 2009, [Peer-reviewed]
English, Scientific journal - Effect of molecular morphology on amplified spontaneous emission of bis-styrylbenzene derivatives
Kabe, R., Nakanotani, H., Sakanoue, T., Yahiro, M., Adachi, C.
Advanced Materials, 21, 40, 2009, [Peer-reviewed]
Scientific journal - Organic light emitting devices from OLED to organic laser diode
Adachi Chihaya, Matsushima Toshinori, Nakanotani Hajime, Yokoyama Daisuke, Yahiro Masayuki, AOE
Aoe 2007: Asia Optical Fiber Communication & Optoelectronic Exposition & Conference, Conference Proceedings, 189, 191, 2008, [Peer-reviewed] - Blue-light-emitting ambipolar field-effect transistors using an orqanic single crystal of 1,4-Bis(4-methylstyryl)benzene
Nakanotani H, Kabe R, Yahiro M, Takenobu T, Iwasa Y, Adachi C
Applied Physics Express, 1, 9, 0918011, 0918013, The Japan Society of Applied Physics, 2008, [Peer-reviewed]
English - Very low amplified spontaneous emission threshold and electroluminescence characteristics of 1,1 '-diphenyl substituted fluorene derivatives
Hajime Nakanotani, Naoki Matsumoto, Hiroyuki Uchiuzou, Masakazu Nishiyama, Masayuki Yahiro, Chihaya Adachi
OPTICAL MATERIALS, 30, 4, 630, 636, Dec. 2007, [Peer-reviewed]
English, Scientific journal - Spectrally narrow emission at cutoff wavelength from edge of electrically pumped organic light-emitting diodes
Daisuke Yokoyama, Hajime Nakanotani, Yousuke Setoguchi, Masato Moriwake, Dai Ohnishi, Masayuki Yahiro, Chihaya Adachi
JAPANESE JOURNAL OF APPLIED PHYSICS PART 2-LETTERS & EXPRESS LETTERS, 46, 33-35, L826, L829, Sep. 2007, [Peer-reviewed]
English, Scientific journal - Extremely low-threshold amplified spontaneous emission of 9,9 '-spirobifluorene derivatives and electroluminescence from field-effect transistor structure
Hajime Nakanotani, Seiji Akiyama, Dai Ohnishi, Masato Moriwake, Masayuki Yahiro, Toshitada Yoshihara, Seiji Tobita, Chihaya Adachi
ADVANCED FUNCTIONAL MATERIALS, 17, 14, 2328, 2335, Sep. 2007, [Peer-reviewed]
English, Scientific journal - Spectrally narrow emission from organic films under continuous-wave excitation
Hajime Nakanotani, Chihaya Adachi, Sadayuki Watanabe, Ryuzi Katoh
APPLIED PHYSICS LETTERS, 90, 23, Jun. 2007, [Peer-reviewed]
English, Scientific journal - Ambipolar field-effect transistor based on organic-inorganic hybrid structure
Hajime Nakanotani, Masayuki Yahiro, Chihaya Adachi, Koki Yano
APPLIED PHYSICS LETTERS, 90, 26, Jun. 2007, [Peer-reviewed]
English, Scientific journal - Very low-threshold amplified spontaneous emission characteristics of bis-styrylbenzene derivatives and their electrical pumping
Hajime Nakanotani, Daisuke Yokoyama, Chihaya Adachi
Optics InfoBase Conference Papers, Optical Society of America (OSA), 2007
English, International conference proceedings - Frontier of organic light emitting devices
Chihaya Adachi, Toshinori Matsushima, Hajime Nakanotani, Tomo Sakanoue, Masayuki Yahiro, Daisuke Yokoyama
PROCEEDINGS OF THE 2007 INTERNATIONAL WORKSHOP ON THE PHYSICS OF SEMICONDUCTOR DEVICES: IWPSD-2007, 534, 538, 2007, [Peer-reviewed]
English, International conference proceedings - Optical and electrical properties of bis(4-(phenylethynyl)phenyl)ethynes and their application to organic field-effect transistors
Takahito Oyamada, Guang Shao, Hiroyuki Uchiuzou, Hajime Nakanotani, Akihiro Orita, Junzo Otera, Masayuki Yahiro, Chihaya Adachi
JAPANESE JOURNAL OF APPLIED PHYSICS PART 2-LETTERS & EXPRESS LETTERS, 45, 46-50, L1331, L1333, Dec. 2006, [Peer-reviewed]
English, Scientific journal - Extremely-high-density carrier injection and transport into organic thin films and prospects for organic laser diodes
Toshinori Matsushima, Hajime Nakanotani, Hiroyuki Sasabe, Chihaya Adachi
Optics InfoBase Conference Papers, Optical Society of America (OSA), 2005
English, International conference proceedings - Low lasing threshold in organic distributed feedback solid state lasers using bisstyrylbenzene derivative as active material
Hajime Nakanotani, Hiroyuki Sasabe, Chihaya Adachi
Proceedings of SPIE - The International Society for Optical Engineering, 5937, 1, 7, 2005, [Peer-reviewed]
English, International conference proceedings - Injection and transport of high current density over 1000A/cm(2) in organic light emitting diodes under pulse excitation
Nakanotani H, Oyamada T, Kawamura Y, Sasabe H, Adachi C
Japanese Journal of Applied Physics Part 1-Regular Papers Brief Communications & Review Papers, 44, 6A, 3659, 3662, INSTITUTE OF PURE AND APPLIED PHYSICS, 2005, [Peer-reviewed]
English, We succeeded in injecting and transporting a maximum high current density of $J=1163$ A/cm2 in organic light-emitting diodes using short-pulse excitation combined with a highly thermally conductive silicon substrate (thermal conductivity: 148 W m-1 K-1) and a small cathode configuration (cathode radius $r=50$ μm). A maximum current density almost 20 times higher than that associated with direct current (DC) operation was observed by driving an OLED with a short pulse voltage. With short-pulse excitation, the decrease in external quantum efficiency ($\eta_{\text{ext } }$) obeyed a typical singlet–singlet exciton annihilation model well, indicating that the generation of Joule heat in OLEDs can be suppressed under pulse operation. - Singlet-singlet and singlet-heat annihilations in fluorescence-based organic light-emitting diodes under steady-state high current density
Nakanotani H, Sasabe H, Adachi C
Applied Physics Letters, 86, 21, "213506, 1"-"213506-3", 2005, [Peer-reviewed]
Other Activities and Achievements
- 励起状態分子内プロトン移動材料の構造解析と熱活性化遅延蛍光特性
儘田正史, 儘田正史, 稲田工, 稲田工, 小簑剛, 小簑剛, POTSCAVAGE William J., Jr., POTSCAVAGE William J., Jr., 中野谷一, 中野谷一, 安達千波矢, 安達千波矢, 安達千波矢, 九州大学中央分析センター報告(Web), 35, 2018 - 第三世代有機EL発光材料の展開 : 熱活性化遅延蛍光材料からレーザーまで (特集 有機ELの最新動向と将来展望)
中野谷 一, 安達 千波矢, 光アライアンス, 28, 7, 9, 13, Jul. 2017
日本工業出版, Japanese - 高平面・縮環構造の熱活性化遅延蛍光材料を導出可能な新規分子設計
儘田正史, 稲田工, 小簑剛, 中野谷一, 安達千波矢, 儘田正史, 稲田工, 小簑剛, 中野谷一, 安達千波矢, 安達千波矢, 応用物理学会春季学術講演会講演予稿集(CD-ROM), 64th, 2017 - 受賞記念寄稿 熱活性化遅延蛍光過程を利用した高性能蛍光有機ELデバイスの開発
中野谷 一, 安達 千波矢, Molecular electronics and bioelectronics = 応用物理学会,有機分子・バイオエレクトロニクス分科会会誌, 27, 4, 221, 226, Nov. 2016
応用物理学会有機分子・バイオエレクトロニクス分科会, Japanese - High performance organic light-emitting diodes based on thermally-activated delayed fluorescence materials
Hajime Nakanotani, Chihaya Adachi, Journal of the Vacuum Society of Japan, 58, 3, 73, 78, 2015
Vacuum Society of Japan, Japanese, Book review - Invention of highly efficient TADF materials and their application for OLEDs
Nakanotani Hajime, Adachi Chihaya, ITE Technical Report, 38, 12, 5, 8, Mar. 2014
We demonstrate a novel pathway to open an ultimate electroluminescence (EL) efficiency by using simple aromatic compounds displaying efficient thermally activated delayed fluorescence (TADF) having high photoluminescence (PL) efficiency. We found that a proper design of organic molecules enables the formation of a small energy gap between singlet and triplet excited states, resulting in the enhanced T_1 to S_1 reverse intersystem crossing (ISC). We also demonstrate very high efficiency EL using a new series of TADF materials., The Institute of Image Information and Television Engineers, Japanese - 高移動度・高発光効率有機発光トランジスタの実現
八尋 正幸, 中野 谷一, 安達 千波矢, Molecular electronics and bioelectronics, 21, 2, 99, 102, 25 May 2010
Japanese - 有機発光トランジスタ--新しい有機発光デバイスの展開 (特集 注目される有機EL膜とその応用)
中野谷 一, 安達 千波矢, 光技術コンタクト, 48, 2, 51, 55, Feb. 2010
日本オプトメカトロニクス協会, Japanese - 有機発光トランジスタ : 有機ELと有機トランジスタの融合
中野谷 一, 安達 千波矢, 化学と工業 = Chemistry and chemical industry, 63, 2, 127, 130, 01 Feb. 2010
日本化学会, Japanese - Organic single crystal FET aiming for organic semiconductor laser devices
中野谷 一, 安達 千波矢, Optronics, 27, 12, 106, 112, Dec. 2008
オプトロニクス社, Japanese - 22aTB-3 Ambipolar Light-Emitting Field-Effect Transistors Based on Organic Single Crystals
Yomogida Y., Takenobu T., Bisri S. Z., Nakanotani H., Yahiro M., Adachi C., Yamao T., Hotta S., Iwasa Y., Meeting abstracts of the Physical Society of Japan, 63, 2, 758, 758, 25 Aug. 2008
The Physical Society of Japan (JPS), Japanese - 2,7-bis[4-(N-carbazole)phenylvinyl]-9,9’-spirobifluoreneを活性層に用いた低閾値青色First-order DFBレーザー
平出雅哉, 中野谷一, 池田晃裕, 服部励治, 八尋正幸, 安達千波矢, 応用物理学会九州支部学術講演会講演予稿集, 34, 2008 - 電流励起型有機半導体レーザーを目指したFirst-order DFB共振器の作製とレーザー特性
平出雅哉, 中野谷一, 服部励治, 八尋正幸, 安達千波矢, ナノ学会大会講演予稿集, 6th, 2008 - Research and Development from OLED to Organic Laser Diodes
ADACHI Chihaya, MATSUSHIMA Toshinori, NAKANOTANI Hajime, Japanese journal of optics, 35, 11, 556, 563, 10 Nov. 2006
応用物理学会分科会日本光学会, Japanese - 有機半導体レーザーへの挑戦--低閾値レーザー色素材料の開発 (特集 材料からのブレークスルー)
安達 千波矢, 中野谷 一, オプトロニクス, 25, 11, 123, 126, Nov. 2006
オプトロニクス社, Japanese - Singlet exciton annihilation in Alq3 based organic light-emitting diodes
NAKANOTANI H., International Discussion Meeting on Alq3, Okochi Hall, RIKEN, WAKO, Japan (21 sep. 2004), 2004
Books and other publications
- 未来を拓く多彩な色素材料 Part II １８章
中野谷 一, 安達 千波矢
Mar. 2021, Japanese, Scholarly book, [Joint work] - 未来を拓く多彩な色素材料 : エレクトロニクスから医科学にまで広がる色素の世界
日本化学会, １重項励起子開裂：有機エレクトロルミネッセンスへの応用
化学同人, Mar. 2021, 9784759814002, v, 194p, 図版 [4] p, Japanese, [Contributor] - 先端有機半導体デバイス：1-2節
中野谷一
オーム社, Aug. 2017, Japanese, Scholarly book, [Joint work] - 最先端の有機EL：編集 安達千波矢/藤本弘：第４章 有機発光材料の光物理過程 （中野谷一）
中野谷一
シーエムシー出版, Apr. 2017, Japanese, Scholarly book, [Joint work] - Role of intermediate state in the excited state dynamics of highly efficient TADF molecules
Takuya Hosokai, Hiroyuki Matsuzaki, Akihiro Furube, Katsumi Tokumaru, Tetsuo Tsutsui, Hajime Nakanotani, Masayuki Yahiro, Chihaya Adachi
SPIE, Jan. 2016, English, We hereby report the results of our direct investigation into the excited-state dynamics of thermally activated delayed fluorescence (TADF) molecules in solution using pump-probe transient absorption spectroscopy (TAS). We found that the charge-transfer (CT) state commonly stated for TADF molecules encompasses two forms: localized and delocalized CT states. A highly efficient TADF molecule, 4CzIPN [Uoyama et al., Nature, 492, 234-238 (2012)], showed both the localized and delocalized CT states, while an inefficient TADF molecule, 2CzPN, exhibited only a localized CT state. By analyzing the time profile of triplet species observed in TAS, we propose that the reverse intersystem crossing (RISC) of 4CzIPN occurs via a mutual interaction in multiple energy levels of localized neutral and CT states, and delocalized CT states. - High-efficiency organic light-emitting diodes with blue fluorescent emitter
Takahiro Higuchi, Hajime Nakanotani, Chihaya Adachi
Optical Society of America (OSA), Nov. 2014, English, We achieved highly efficient blue fluorescent emitter based OLEDs by utilizing a thermally activated delayed fluorescence (TADF) material as a triplet energy harvesting source and a conventional blue fluorescence molecule as the end emitter. - Light-Emitting Organic Crystal Field-Effect Transistors for Future Organic Injection Lasers
Hajime Nakanotani, Chihaya Adachi
Wiley-VCH, Jan. 2013, English
Lectures, oral presentations, etc.
- Enhancing OLEDs Lifetime by Expanding CT Interface with TADF Assistant Dopant
Nguyen Ba Thanh, Hajime Nakanotani, Chihaya Adachi
The 70th JSAP Spring Meeting 2023, Mar. 2023, Japanese
May 2023 - May 2023, オンライン, Japan, [Domestic Conference] - Highly efficient invisible electroluminescence from organic light-emitting diodes
Hajime Nakanotani
日本化学会第103春季年会, Mar. 2023, Japanese
May 2023 - May 2023, 東京理科大学, Japan, [Invited], [Domestic Conference] - Photophysical property of 4CzIPN single crystal
Kohata Shintaro, Nakanotani Hajime, Adachi Chihaya
1st Q-PIT photofunction integration workshop, Feb. 2023, Japanese
May 2023 - May 2023, 佐賀県, Japan, [Domestic Conference] - 弱アクセプター構造を用いた深青TADF 材料の創出とOLED 特性
儘田正史, 片桐洋史, Chan Chin-Yiu, Lee Yi-Ting, 合志憲一, 中野谷 一, 畠山琢次, 安達千波矢
光化学討論会, Sep. 2022, Japanese
May 2023 - May 2023, 京都, Japan, [Domestic Conference] - 1,2,3,5-tetrakis(carbazol-9-yl)-4,6-dicyanobenzene単結晶の光物性
木幡真太郎, 中野谷一, 安達千波矢
日本化学会九州支部大会, Jul. 2022, Japanese
May 2023 - May 2023, 北九州市, Japan, [Domestic Conference] - Excited-state structural dynamics and thermally activated delayed fluorescence in solid-state for donor-acceptor type molecules
Masaki Saigou, Kiyoshi Miyata, Hajime Nakanotani, Chihaya Adachi, Ken Onda
ICSM 2022, Jul. 2022, English
May 2023 - May 2023, Glasgow, United Kingdom, [International presentation] - Characterization of excited states in TADF molecules with dual emission using time-resolved infrared spectroscopy
Tomohiro Ryu, Yuushi Shimoda, Masaki Saigou, Ryota Fukuda, Kiyoshi Miyata, Upuichi Tsuchiya, Hajime Nakanotani, Chihaya Adachi, Ken onda
ICSM 2022, Jul. 2022, Japanese
May 2023 - May 2023, Glasgow, United Kingdom, [International presentation] - Deep-Blue Thermally Activated Delayed Fluorescence Emitters Aimed at Narrow Fluorescence-like Emission
Chin-Yiu Chan, Yi-Ting Lee, Masashi Mamada, Kenichi Goushi, Youichi Tsuchiya, Hajime Nakanotani, Chihaya Adachi
有機EL討論会第３４回例会, May 2022, Japanese
May 2023 - May 2023, オンライン, Japan, [Domestic Conference] - 有機薄膜中での自発的な励起子解離現象とその応用
中野谷 一
第71回高分子討論会, Sep. 2022, Japanese
05 Sep. 2022 - 07 Sep. 2022, 北海道大学 札幌キャンパス, Japan, [Invited], [Domestic Conference] - Spontaneous dissociation of charge-transfer type excitons in organic solid-state films
Hajime Nakanotani
日本化学会第102春季年会, Mar. 2022, English
20 Mar. 2022 - 23 Mar. 2022, オンライン, Japan, [Invited], [Domestic Conference] - 有機分子における項間交差過程の理解と有機EL素子への応用
中野谷一
日本学術振興会第142委員会第77回研究会(C部会研究会), Oct. 2017, Japanese
17 Oct. 2017 - 17 Oct. 2017, キャンパスプラザ京都, Japan, [Invited], [Domestic Conference] - Excited state engineering for efficient RISC process
Hajime Nakanotani
第67回錯体化学会討論会, Sep. 2017, Japanese
16 Sep. 2017 - 18 Sep. 2017, 北海道大学, Japan, [Invited], [Domestic Conference] - 高性能有機光デバイスのための分子デザイン
中野谷一
第78回応用物理学会秋季学術講演会, Sep. 2017, Japanese
05 Sep. 2017 - 08 Sep. 2017, 福岡国際会議場, Japan, [Invited], [Domestic Conference] - 熱活性化遅延蛍光分子を利用する高性能有機エレクトロルミネッセンスデバイス
中野谷一
第66回高分子学会年次大会, May 2017, Japanese
29 May 2017 - 31 May 2017, 幕張メッセ, Japan, [Invited], [Domestic Conference] - High efficiency organic light-emitting diodes based on a TADF molecules combined with fluorescence emitters
Nakanotani Hajime
The 15th International Symposium on the Science and Technology of Lighting, 24 May 2016, English
24 May 2016 - 24 May 2016, Japan, [Invited], [International presentation] - Highly Efficient Organic Light-Emitting Diodes Exploiting Thermally Activated Delayed Fluorescence
Nakanotani Hajime
9th International Symposium on Organic Molecular Electronics, 18 May 2016, English
18 May 2016 - 19 May 2016, Japan, [Invited], [International presentation] - High Efficiency Organic Light-Emitting Diodes with Fluorescent Emitters
Hajime Nakanotani
Taiwan Solid State Lighting Symposium, 26 Mar. 2015, English
Taiwan, Province of China, Fluorescence-based organic light-emitting diodes (OLEDs) have continued to attract interest because of their long operational lifetimes, high color purity of electroluminescence (EL), and potential to be manufactured at low-cost in next generation full-color display and lighting applications. In fluorescent molecules, however, the exciton production efficiency is limited to 25% due to the deactivation of triplet excitons. Here, we demonstrate an novel pathway for high-efficient fluorescence-based OLEDs by applying the general concept of thermally activated delayed fluorescence (TADF) to a assistant dopant, resulted in the fluorescence-OLEDs showed high external EL quantum efficiencies of 13.4 - 18.0% for blue, green, yellow, and red emission, indicating that the exciton production efficiency reached nearly 100%., [Invited], [International presentation] - High efficiency organic light-emitting diodes with conventional fluorescent emitters
Hajime Nakanotani, Chihaya Adachi
Solid-State and Organic Lighting, SOLED 2014, Nov. 2014, English
02 Dec. 2014 - 05 Dec. 2014, Canberra, Australia, We demonstrate an novel pathway for high-efficient fluorescence-based organic lightemitting diodes (OLEDs) by applying the general concept of thermally activated delayed fluorescence (TADF) to a assistant dopant, resulted in the fluorescence-OLEDs showed high external EL quantum efficiencies of 13.4-18.0% for blue, green, yellow, and red emission, indicating that the exciton production efficiency reached nearly 100%.
Courses
- 応用化学実験第二
九州大学
2023, Undergraduate special subjects - 応用化学A
九州大学
2023, Postgraduate courses - 応用化学実験第一
九州大学
2022, Undergraduate special subjects - Organic Solid State Photophysics
Kyushu University
2022, Postgraduate courses - 量子化学
九州大学
2022, Undergraduate special subjects - 量子化学演習
九州大学
2022, Undergraduate special subjects - 物質科学工学実験第三
九州大学
2022, Undergraduate special subjects - 応用化学A
九州大学
2022, Postgraduate courses - 有機固体光電子物性
九州大学
2022, Postgraduate courses - 量子化学演習
九州大学
2021, Undergraduate special subjects - Physical Chemistry B
Kyushu University
2021, Undergraduate special subjects - 量子化学第二
九州大学
2021, Undergraduate special subjects - 知的財産学
九州大学
2021, Postgraduate courses - Physical Chemistry B
Kyushu University
2020, Undergraduate special subjects - 量子化学演習
九州大学
2020, Undergraduate special subjects - 知的財産学
九州大学
2020, Postgraduate courses - Organic Solid State Photophysics
Kyushu University
2020, Postgraduate courses - 自然科学総合実験（発展）
九州大学
2020, Undergraduate liberal arts - 量子化学第二
九州大学
2020, Undergraduate special subjects - 有機固体光電子物性
九州大学
2020, Postgraduate courses - 自然科学総合実験（発展）
九州大学
2019, Undergraduate liberal arts - 知的財産学
九州大学
2019, Postgraduate courses - Physical Chemistry B
Kyushu University
2019, Undergraduate special subjects - 量子化学演習
九州大学
2019, Undergraduate special subjects - 量子化学第二
九州大学
2019, Undergraduate special subjects - 自然科学総合実験
九州大学
2018, Undergraduate liberal arts - 量子化学演習
九州大学
2018, Undergraduate special subjects - Physical Chemistry B
Kyushu University
2018, Undergraduate special subjects - Organic Solid State Photophysics
Kyushu University
2018, Postgraduate courses - 光機能化学
九州大学
2018, Postgraduate courses - 知的財産学
九州大学
2018, Postgraduate courses - 量子化学第二
九州大学
2018, Undergraduate special subjects - 有機固体光電子物性
九州大学
2018, Postgraduate courses - 知的財産学
九州大学
2017, Postgraduate courses - 分析化学演習
九州大学
2017, Undergraduate special subjects - 量子化学演習
九州大学
2017, Undergraduate special subjects - Physical Chemistry B
Kyushu University
2017, Undergraduate special subjects - 自然科学総合実験
九州大学
2017, Undergraduate liberal arts - 量子化学第二
九州大学
2017, Undergraduate special subjects - 量子化学第二
九州大学
2016, Undergraduate special subjects - 有機固体光電子物性
九州大学
2016, Postgraduate courses - 物理化学B
九州大学
2016, Undergraduate special subjects - 自然科学総合実験
九州大学
2016, Others - 物理化学B
九州大学
2015, Undergraduate special subjects - 化学英語
九州大学
2015, Undergraduate special subjects - 自然科学総合実験
九州大学
2015, Others
Research Themes
- Organic semiconductor lasers aimed at low lasing threshold
Grants-in-Aid for Scientific Research
01 Apr. 2023 - 31 Mar. 2028
安達 千波矢, 中野谷 一, 儘田 正史, 合志 憲一, 田中 正樹
Japan Society for the Promotion of Science, Grant-in-Aid for Specially Promoted Research, Kyushu University, 23H05406 - Organic Semiconductor spinorbitronics
Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (A)
01 Apr. 2020 - 31 Mar. 2025
渡邉 峻一郎, 下位 幸弘, 岡本 敏宏, 中野谷 一
本研究では、有機半導体におけるスピン軌道相互作用(SOC)の「制御」・「理解」・「機能化」を三位一体とし、スピンオービトロニクスを基盤とした革新的電子スピンデバイスの創成を目指す。SOCはスピン磁気モーメントと電子の軌道運動が生み出す磁場の相互作用である。無機個体におけるSOCの研究は古くから行われているものの、軽元素から構成される有機固体におけるSOCは意味だに未解明な部分も多い。本研究では、適切にSOC制御されたヘテロアセン分子群を用いて、革新的な電子スピンデバイス実装の足がかりとなる基盤研究を遂行してきた。ここでは、合成化学・凝縮系固体物理学・デバイス工学を包括的に組み 合わせることでのみ実現する有機スピンオービトロニクスの学理を整備し、有機半導体ならではのフレキシビリティや低温・塗布プロセスの強みを活かした革新 的な基盤技術・マテリアルサイエンスへと展開する。 研究二年次では、従来溶液中の孤立分子でのみ計測されていなかったSOCを固体薄膜において実測する手法の開発を進め、含カルコゲンヘテロアセン材料を対象にSOCの定量化に到る方法論を確立を進めた。SOCの理論的なアプローチは密度汎関数計算をベースに下位幸弘と共に行った。並行し て、代表者である渡邉は、スピン機能性の計測を行うためのデバイス作製手法の開発や、測定系の構築を行い、有機半導体のSOCを統一的に理解するためのツール を整備した。特に、極低温における磁気抵抗効果からSOCの強さを電気的に検出可能な道筋も経ちつつあり、顕著な成果が得られつつある。
Japan Society for the Promotion of Science, Grant-in-Aid for Scientific Research (A), The University of Tokyo, 20H00387 - Organic Thin-Film Superconductor Based on Electric Polarization
Grants-in-Aid for Scientific Research Grant-in-Aid for Challenging Research (Pioneering)
09 Jul. 2021 - 31 Mar. 2024
安達 千波矢, 松島 敏則, 合志 憲一, 中野谷 一
従来、有機超伝導体は主にCT錯体を中心に、その可能性が1970年代から90年初頭に亘って幅広く検討されてきたが、極低温や超高圧条件が必要であり、室温有機超伝導体実現への道程はほど遠い状況にある。そのため、新規なメカニズムや材料・デバイス構成に関する斬新なアイディアが必要とされている。本提案では、Little及びGinzburgの2つの古典的なモデルを基礎に、近年、有機光エレクトロニクス研究分野で培われてきた新規な有機系CT材料や薄膜中で特異的に大きな分極（GSP: Giant Spontaneous Polarization）を示す分子系材料、さらには、近年、太陽電池等で大きな注目を集めている有機・無機ハイブリッドペロブスカイト構造を利用し、積層薄膜型の室温有機超伝導の実現に取り組む。具体的には電子分極層(P)/導電層（C）/電子分極層(P)を基本構造とし、薄膜導電層中の伝導電子と誘電層内の分極性分子との間で電子分極効果を発現することでクーパー対の形成を目指している。
本年度は、Littleのモデルとして、二次元ペロブスカイト構造を基礎に有機・無機材料成分の最適化について検討を行い、薄膜形成や単結晶形成を試み、電気物性計測が可能なデバイスを構築、基礎的な電気伝導性の確認を行った。また、Ginzburgのモデルにおいては、ドナー分子としてmMTDATAを、アクセプター分子としてF16CuPcを用いることで、積層薄膜構造において分子間CTを形成し導電性の著しい向上を確認した。今後、2種類の材料系において、電子分極の大きさを調整し、導電層内のクーパー電子対形成に繋げていく。
Japan Society for the Promotion of Science, Grant-in-Aid for Challenging Research (Pioneering), Kyushu University, 21K18210 - 電子スピン選択的な励起子解離による革新的有機光電変換素子の創製
科学研究費助成事業 基盤研究(B)
01 Apr. 2021 - 31 Mar. 2024
中野谷 一
本研究の最終目標は、有機分子系において生成される電荷移動（CT）型励起子に着目し、励起子解離過程における励起スピン状態選択性を実証することで、逆電子移動損失ゼロという革新的な光電変換素子を実現することである。
R3年度においては、熱活性化遅延蛍光（TADF）分子である2,4,5,6-tetra(9H-carbazol-9-yl)iso-phthalonitrile (4CzIPN)、1,2,4,5-tetrakis(carbazol-9-yl)-3,6-dicyanobenzene (4CzTPN)をモデル化合物として、薄膜中での電荷生成機構の解明、および励起スピン状態が励起子解離過程に及ぼす影響について研究を実施した。薄膜中での電荷生成機構の解明に関しては、光電子顕微鏡を検出器とする二光子光電子分光を用いた時間分解光電子顕微鏡（TR-PEEM）により、TADF分子膜中での電荷生成の過渡的な検出に成功した（Advanced Optical Materials, 9, 2100619, 2021）。また励起スピン状態が励起子解離に及ぼす影響に関する研究では、新たに開発した電場変調型過渡発光測定装置を用い、各種TADF分子をドーピングした共蒸着薄膜を試料として電場変調型過渡発光測定を実施した。その結果、分子内TADFを示す4CzIPN薄膜では、励起一重項準位からではなく、励起三重項準位から優先的に励起子解離が進行している事実を明らかとした（Science Advances, 8, abj9188, 2022）。これは、励起三重項状態の励起子寿命が励起一重項状態よりも極めて長いとともに、その励起子解離エネルギーが同程度であるためと理解できる。この結果は、従来は電荷損失の原因とされていた励起三重項状態が、本質的には励起子解離に対して有利であることを示す結果である。
日本学術振興会, 基盤研究(B), 九州大学, 21H02015 - Development of high-performance organic semiconductor electrets
Grants-in-Aid for Scientific Research Grant-in-Aid for Challenging Research (Exploratory)
09 Jul. 2021 - 31 Mar. 2023
中野谷 一
本研究では振動発電に着目し、その核心材料であるエレクトレット材料の性能を飛躍的に高め、これまでにないエレクトレット材料を創出することを最終的な研究目的としている。近年、有機低分子薄膜で形成される有機薄膜中分子の自発配向分極を利用することで、コロナ帯電処理なしに自己組織化的にエレクトレットが形成されることが報告され、大きく注目されている。そこでR3年度の研究では、種々の有機半導体分子における自発配向分極特性を調査するとともに、有機分子薄膜で形成される自発配向分極を制御するための因子について検討し、自己組織化エレクトレットを使用した振動発電素子をより高出力化する手法を提案することを目指した。
R3年度は、ケルビンプローブ法を用いて有機半導体薄膜の自発配向分極特性を観測するため、その場測定可能な真空蒸着装置を設計・構築した。また、3,6-bis(diphenylphosphoryl)-9-phenylcarbazole（PO9）をモデル化合物として、9-(3,5-bis(diphenylphosphoryl)phenyl)-9H-carbazole（CzPO2）、2,7-bis(diphenylphosphoryl)-9-phenyl-9H-carbazole（PPO27）、9-phenyl-3,6-bis(4-(1-phenyl-1H -benzoimidazol-2-yl)phenyl)-9H-carbazole（CNBzIm）などの誘導体について、その自発配向分極特性を作製した装置を用いて評価した。結果、CNBzIm薄膜が大きな自発配向分極（~80 mV/nm）を示すこと、さらに蒸着速度および蒸着回数、成膜待機時間が、自発配向分極特性に大きく影響することを見出した。これは、真空蒸着中の有機薄膜表面における分子配向挙動が、その自発配向分極特性を決定しているためと理解できる。
Japan Society for the Promotion of Science, Grant-in-Aid for Challenging Research (Exploratory), Kyushu University, 21K19010 - Organic light-emitting diodes possess 200% exciton production efficiency
Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (B)
01 Apr. 2018 - 31 Mar. 2021
Nakanotani Hajime
In this study, we aimed to dramatically improve the exciton generation yield in organic light-emitting diode (OLED) by fusing two different spin conversion mechanisms: (1) thermally-activated delayed fluorescence (TADF), and (2) singlet fission (SF) processes. During this research project, the world's first SF-type OLED that exhibits over 100% exciton generation yield was realized by incorporating molecules showing SF into the OLED. Further, the basic physics of the TADF process was clarified from both experimental and theoretical aspects, and we succeeded in developing a highly efficient and durable NIR-OLED that can be applied to practical applications. Through this research project, the feasibility of "OLED exhibiting exciton generation yield of 200%" was obtained.
Japan Society for the Promotion of Science, Grant-in-Aid for Scientific Research (B), Kyushu University, 18H02047 - Degradation mechanism of TADF OLED and advanced materials
Grants-in-Aid for Scientific Research
01 Apr. 2017 - 31 Mar. 2020
Adachi Chihaya
OLEDs using TADF molecules are a breakthrough technology that can convert electric current to light with almost 100% efficiency using relatively simple aromatic compounds. Under current excitation, TADF molecules can up-convert a triplet excited state to a singlet excited state with 100% quantum efficiency. However, since it passes through the triplet state, it has a relatively short device lifetime, and it has been expected that the durability is improved by the short triplet excitation lifetime. In this study, we succeeded in creating an epoch-making TADF molecule with triplet excitation lifetime of 750ns by using precise stereo-control of donor and acceptor units and through-space interaction.
Japan Society for the Promotion of Science, Grant-in-Aid for Scientific Research (A), Kyushu University, 17H01232 - Low-work function conductors based on magnesium alloy towards low-cost and air-stable organic electronics
Grants-in-Aid for Scientific Research
2016 - 2018
Nakanotani Hajime
In the OLEDs, when expose them to ambient air without any encapsulation layer, a non-emissive spots, i.e., “dark spots”, are grow up with increase an operational time according to low corrosion resistance of low work-function metal, leading to death of the OLEDs. Thus, encapsulation with a high required performance for prevent the penetration of water and oxygen or complexity of the device architecture is believed to be the solutions for preventing a degradation of OLEDs even in air, but these ideas wreak both an increasing of final fabrication time and production cost. Here, we report on that simple but effective approach to toward “low-cost” and “air-stable” OLEDs, in which a utilization of low WF ternary alloy system based on Mg- Ca-Al that had been overlooked during the long years of research on organic electronics.
Japan Society for the Promotion of Science, Grant-in-Aid for Young Scientists (B), Kyushu University, Principal investigator, Competitive research funding, 16K21211 - Fluorescence organic light-emitting diodes with 100% internal EL quantum efficiency
Grants-in-Aid for Scientific Research
2014 - 2016
Nakanotani Hajime
We demonstrate an novel pathway for high-efficient fluorescence-based OLEDs by applying the general concept of thermally activated delayed fluorescence (TADF) to a assistant dopant, resulted in the fluorescence-OLEDs showed exciton production efficiency reached nearly 100%. In addition, the enhancement of operational stability compared to that of OLEDs using the TADF molecules as emitters was observed, indicating that the our proposed energy transfer process can provide dual enhancement of both EL efficiency and operational stability in OLEDs by rapid upconversion of triplet excitons.
Japan Society for the Promotion of Science, Grant-in-Aid for Young Scientists (B), Kyushu University, Principal investigator, Competitive research funding, 26810110
Industrial Property Rights
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