Publications | Aizawa Research Group

42

White Organic Light-Emitting Diodes with Extremely Low Turn-on Voltage at 1.5 V

Yang Yiyan, Qing-Jun Shui, Hiroto Iwasaki, Daiki Nakahigashi, Yutaka Majima, Ken-ichi Nakayama, Naoya Aizawa, Seiichiro Izawa*

J. Mater. Chem. C 2025, 13, 16963–16968.

41

Highly Porous, Electrically Conductive Two-Dimensional Nickel–Hexaaminodehydrobenzoannulene Frameworks

Enzo Ohkubo, Mitsuharu Suzuki,* Naoya Aizawa, Osamu Ikeda, Showa Kitajima, Tomoyuki Koganezawa, Kaoru Ohta, Kouki Oka, Norimitsu Tohnai, Keisuke Tominaga, Ken-ichi Nakayama

J. Am. Chem. Soc. 2025, 147, 31940–31951.

40

Triplet-Triplet Annihilation Photon Upconversion Using TIPS-Benzene and Heptazine Derivatives for UVC Energy Generation

Masanori Uji, Sakura Nakagawa, Atsuko Nihonyanagi, Daigo Miyajima, Naoya Aizawa, Nobuhiro Yanai*

Adv. Opt. Mater. 2025, e01279.

39

Bayesian Molecular Optimization for Accelerating Reverse Intersystem Crossing

Taehyun Won, Naoya Aizawa,* Yu Harabuchi,* Reo Kurihara, Mitsuharu Suzuki, Satoshi Maeda, Yong-Jin Pu, Ken-ichi Nakayama

Chem. Sci. 2025, 16, 9303–9310.

38

Thermally Activated Delayed Fluorescence (TADF) Active Systems: Mechanism, Applications, and Future Directions

Naoya Aizawa,* Ricardo Javier Vázquez*

J. Phys. Chem. C 2025, 129, 3359–3360.

37

Dynamic excitons in organic light-emitting systems

Katsuaki Suzuki, Eri Sakuda, Yosuke Tani, Midori Akiyama, Ken Albrecht, Naoya Aizawa, Seiichiro Izawa, Hironori Kaji*

J. Chem. Phys. 2025, 162, 061001.

36

Defect engineering in organic semiconductor based metal-dielectric photonic crystals

Khadga S. Thakuri, Thomas Cleary, David Allemeier, Taisei Kimura, Naoya Aizawa, Ken-ichi Nakayama, Akito Masuhara, Matthew S. White*

Sci. Rep. 2024, 14, 29052.

35

Inverted singlet–triplet emitters for organic light-emitting diodes

Taehyun Won, Ken-ichi Nakayama, Naoya Aizawa*

Chem. Phys. Rev. 2023, 4, 021310.

34

Possibilities and Limitations in Monomer Combinations for Ternary Two-Dimensional Covalent Organic Frameworks

Mitsuharu Suzuki,* Masashi Miura, Enzo Ohkubo, Haru Karimata, Naoya Aizawa, Hiroko Yamada, Ken-ichi Nakayama*

J. Am. Chem. Soc. 2023, 145, 3008–3015.

33

Delayed fluorescence from inverted singlet and triplet excited states

Naoya Aizawa,* Yong-Jin Pu,* Yu Harabuchi, Atsuko Nihonyanagi, Ryotaro Ibuka, Hiroyuki Inuzuka, Barun Dhara, Yuki Koyama, Ken-ichi Nakayama, Satoshi Maeda, Fumito Araoka, Daigo Miyajima*

Nature 2022, 609, 502–506.

32

Dual-acceptor thermally activated delayed fluorescence emitters: Achieving high efficiency and long lifetime in orange-red OLEDs

Xiaoxiao Hu, Naoya Aizawa, Minjun Kim, Miaofei Huang, Zhiyi Li, Guanhao Liu, Honglei Gao, Teng Gao, Xiangyu Dong, Yong Zhang, Jianjun Liu, Pengfei Wang, Yuanping Yi,* Yong-Jin Pu, Ying Wang*

Chem. Eng. J. 2022, 434, 134728.

31

Electron spin resonance resolves intermediate triplet states in delayed fluorescence

Bluebell H. Drummond, Naoya Aizawa, Yadong Zhang, William K. Myers, Yao Xiong, Matthew W. Cooper, Stephen Barlow, Qinying Gu, Leah R. Weiss, Alexander J. Gillett, Dan Credgington, Yong-Jin Pu, Seth R. Marder, Emrys W. Evans*

Nat. Commun. 2021, 12, 4532.

30

Energy Transfer from Blue-Emitting CsPbBr3 Perovskite Nanocrystals to Green-Emitting CsPbBr3 Perovskite Nanocrystals

Kazushi Enomoto, Risa Oizumi, Naoya Aizawa, Takayuki Chiba, Yong-Jin Pu*

J. Phys. Chem. C 2021, 125, 19368–19373.

29

Regulation of Multicolor Fluorescence Changes Found in Donor–acceptor–type Mechanochromic Fluorescent Dyes

Tsutomu Ishi-i,* Honoka Tanaka, Rihoko Kichise, Christopher Davin, Takaaki Matsuda, Naoya Aizawa, In Seob Park, Takuma Yasuda, Taisuke Matsumoto

Chem. Asian J. 2021, 16, 2136–2145.

28

Thermal equilibration between singlet and triplet excited states in organic fluorophore for submicrosecond delayed fluorescence

Naoya Aizawa, Akinobu Matsumoto, Takuma Yasuda*

Sci. Adv. 2021, 7, 5769.

27

Kinetic prediction of reverse intersystem crossing in organic donor–acceptor molecules

Naoya Aizawa,* Yu Harabuchi,* Satoshi Maeda, Yong-Jin Pu

Nat. Commun. 2020, 11, 3909.

26

Molecular beam epitaxy of high-quality CuI thin films on a low temperature grown buffer layer

S. Inagaki, M. Nakamura,* N. Aizawa, L. C. Peng, X. Z. Yu, Y. Tokura, M. Kawasaki

Appl. Phys. Lett. 2020, 116, 192105.

25

Selenium Substitution Enhances Reverse Intersystem Crossing in a Delayed Fluorescence Emitter

Bluebell H. Drummond, Gabrielle C. Hoover, Alexander J. Gillett, Naoya Aizawa, William K. Myers, Bryony T. McAllister, Saul T. E. Jones, Yong-Jin Pu, Dan Credgington,* Dwight S. Seferos*

J. Phys. Chem. C 2020, 124, 6364–6370.

24

Synthesis of Anthracene Derivatives with Azaacene–Containing Iptycene Wings and the Utilization as a Dopant for Solution–Processed Organic Light–Emitting Diodes

Hironobu Hayashi,* Yuki Kato, Akinobu Matsumoto, So Shikita, Naoya Aizawa, Mitsuharu Suzuki, Naoki Aratani, Takuma Yasuda, Hiroko Yamada*

Chem. Eur. J. 2019, 25, 15565–15571.

23

Room–Temperature Phosphorescence from a Series of 3–Pyridylcarbazole Derivatives

Hisahiro Sasabe,* Yuki Kato, Yuichiro Watanabe, Tatsuya Ohsawa, Naoya Aizawa, Wataru Fujiwara, Yong–Jin Pu, Hiroshi Katagiri, Junji Kido*

Chem. Eur. J. 2019, 25, 16294–16300.

22

Mechanochromic fluorescence based on a combination of acceptor and bulky donor moieties: tuning emission color and regulating emission change direction

Tsutomu Ishi-i,* Honoka Tanaka, Ryusuke Youfu, Naoya Aizawa, Takuma Yasuda, Shin-ichiro Kato, Taisuke Matsumoto

New J. Chem. 2019, 43, 4998–5010.

21

Exciplex emissions derived from exceptionally long-distance donor and acceptor molecules

Yong-Jin Pu,* Yuki Koyama, Daisuke Otsuki, Minjun Kim, Hiroya Chubachi, Yuki Seino, Kazushi Enomoto, Naoya Aizawa

Chem. Sci. 2019, 10, 9203–9208.

20

High-Crystallinity π-Conjugated Small Molecules Based on Thienylene-Vinylene-Thienylene: Critical Role of Self-Organization in Photovoltaic, Charge-Transport, and Morphological Properties

Seiichi Furukawa, Hideaki Komiyama, Naoya Aizawa, Takuma Yasuda*

ACS Appl. Mater. Interfaces 2018, 10, 42756–42765.

19

Modulating Photo- and Electroluminescence in a Stimuli-Responsive π-Conjugated Donor-Acceptor Molecular System

Kohei Isayama, Naoya Aizawa, Jun Yun Kim, Takuma Yasuda*

Angew. Chem. Int. Ed. 2018, 57, 11982–11986.

18

High-Performance Dibenzoheteraborin-Based Thermally Activated Delayed Fluorescence Emitters: Molecular Architectonics for Concurrently Achieving Narrowband Emission and Efficient Triplet-Singlet Spin Conversion

In Seob Park, Kyohei Matsuo, Naoya Aizawa, Takuma Yasuda*

Adv. Funct. Mater. 2018, 28, 1802031.

17

Molecular engineering of phosphacycle-based thermally activated delayed fluorescence materials for deep-blue OLEDs

Jiyoung Lee, Naoya Aizawa, Takuma Yasuda*

J. Mater. Chem. C 2018, 6, 3578–3583.

16

Isobenzofuranone- and Chromone-Based Blue Delayed Fluorescence Emitters with Low Efficiency Roll-Off in Organic Light-Emitting Diodes

Jiyoung Lee, Naoya Aizawa, Takuma Yasuda*

Chem. Mater. 2017, 29, 8012–8020.

15

Spin-Dependent Exciton Funneling to a Dendritic Fluorophore Mediated by a Thermally Activated Delayed Fluorescence Material as an Exciton-Harvesting Host

Naoya Aizawa,* So Shikita, Takuma Yasuda*

Chem. Mater. 2017, 29, 7014–7022.

14

Solution-based electrical doping of semiconducting polymer films over a limited depth

Vladimir A. Kolesov, Canek Fuentes-Hernandez, Wen-Fang Chou, Naoya Aizawa, Felipe A. Larrain, Ming Wang, Alberto Perrotta, Sangmoo Choi, Samuel Graham, Guillermo C. Bazan, Thuc-Quyen Nguyen, Seth R. Marder, Bernard Kippelen*

Nat. Mater. 2017, 16, 474–480.

13

Tunable Full-Color Electroluminescence from All-Organic Optical Upconversion Devices by Near-Infrared Sensing

Hiroki Tachibana, Naoya Aizawa, Yu Hidaka, Takuma Yasuda*

ACS Photonics 2017, 4, 223–227.

12

Versatile Molecular Functionalization for Inhibiting Concentration Quenching of Thermally Activated Delayed Fluorescence

Jiyoung Lee, Naoya Aizawa, Masaki Numata, Chihaya Adachi, Takuma Yasuda*

Adv. Mater. 2016, 29, 1604856.

11

Aggregation-induced delayed fluorescence from phenothiazine-containing donor–acceptor molecules for high-efficiency non-doped organic light-emitting diodes

Naoya Aizawa, Chao-Jen Tsou, In Seob Park, Takuma Yasuda*

Polymer J. 2016, 49, 197–202.

10

Design of Thermally Activated Delayed Fluorescence Materials for Organic Light-Emitting Diodes

Naoya Aizawa, In Seob Park, Takuma Yasuda*

AAPPS Bull. 2016, 26, 9–19.

9

Simultaneous cross-linking and p-doping of a polymeric semiconductor film by immersion into a phosphomolybdic acid solution for use in organic solar cells

Naoya Aizawa,* Canek Fuentes-Hernandez, Vladimir A. Kolesov, Talha M. Khan, Junji Kido, Bernard Kippelen

Chem. Commun. 2016, 52, 3825–3827.

8

Fabrication of Organic Light-Emitting Devices Comprising Stacked Light-Emitting Units by Solution-Based Processes

Yong-Jin Pu,* Takayuki Chiba, Kazushige Ideta, Shogo Takahashi, Naoya Aizawa, Tatsuya Hikichi, Junji Kido*

Adv. Mater. 2014, 27, 1327–1332.

7

Solution-processed multilayer small-molecule light-emitting devices with high-efficiency white-light emission

Naoya Aizawa, Yong-Jin Pu,* Michitake Watanabe, Takayuki Chiba, Kazushige Ideta, Naoki Toyota, Masahiro Igarashi, Yoshiyuki Suzuri, Hisahiro Sasabe, Junji Kido*

Nat. Commun. 2014, 5, 5756.

6