日本語 | English
November 19, 2025
In collaboration with Prof. Keisuke Fujimoto, our study elucidating the enhanced antiaromaticity and altered electronic properties upon planarization of cyclic tetraindoles with a cyclooctatetraene core has been accepted for publication in Chemistry –A European Journal.
Keisuke Fujimoto,* Ryo Hirose, Hyuma Masu, Masaki Takahashi, Cyclic Tetraindoles with a Cyclooctatetraene Core: Controlling Planarity and Antiaromatic Character via N-Alkylation, Chem. Eur. J. 2025, e03193. (DOI: 10.1002/chem.202503193)
September 22, 2025
In collaboration with Prof. Seiichiro Izawa (Institute of Science Tokyo), our study achieving green-to-blue photon upconversion in thin films composed of organic semiconductors has been accepted for publication in Japanese Journal of Applied Physics.
Ryunosuke Kani, Keisuke Fujimoto, Koki Banno, Yutaka Majima, Masaki Takahashi, Seiichiro Izawa,* Green to blue photon upconversion in solid-state using anthracene and naphthalene diimide derivatives, Jpn. J. Appl. Phys. 2025, 64, 091004. (DOI: 10.35848/1347-4065/ae0223)
October 22, 2024
Our paper on the development of a visible-light-induced π-extension reaction of perylene derivatives and its regioselectivity has been accepted for publication in European Journal of Organic Chemistry.
Keisuke Fujimoto, Shingo Miyano, Kenshin Norizuki, Toshiyasu Inuzuka, Tetsuya Sengoku,* Masaki Takahashi,* Efficient Visible-Light-Induced π-Extension of Perylene Tetraesters: An Investigation on Regioselectivity, Eur. J. Org. Chem. 2024, e202400734. (DOI: 10.1002/ejoc.202400734)
June 24, 2024
In collaboration with Prof. Seiichiro Izawa (Institute of Science Tokyo), our detailed study of CT → T1 electron transfer at organic semiconductor interfaces has been accepted for publication in Angewandte Chemie.
Hiroto Iwasaki, Keisuke Fujimoto,* Koki Banno, Qing-jun Shui, Yutaka Majima, Masaki Takahashi, Seiichiro Izawa,* Electron Transfer Enhanced by a Minimal Energetic Driving Force at the Organic-Semiconductor Interface, Angew. Chem. Int. Ed., 2024, 63, e202407368. (DOI: 10.1002/anie.202407368)
(August 21, 2024)A press release on this work, “Material Selection Promoting Electron Transfer in Blue OLEDs: Toward Practical Ultra-Low-Voltage Blue OLEDs” (in Japanese), was issued. https://www.shizuoka.ac.jp/news/detail.html?CN=10218
February 8, 2024
Our paper on the synthesis, properties, and photovoltaic characteristics of wavily curved perylene diimides has been accepted for publication in ChemPlusChem.
Keisuke Fujimoto,* Seiichiro Izawa,* Kazuki Yamada, Sota Yagi, Toshiyasu Inuzuka, Kazutaka Sanada, Masami Sakamoto, Masahiro Hiramoto, Masaki Takahashi, Wavily Curved Perylene Diimides: Synthesis, Characterization, and Photovoltaic Properties, ChemPlusChem 2024, e202300748. (DOI: 10.1002/cplu.202300748)
September 20, 2023
In collaboration with Prof. Seiichiro Izawa (Institute of Science Tokyo), our study on a blue organic light-emitting diode operating at an ultra-low voltage has been published in Nature Communications.
Seiichiro Izawa,* Masahiro Morimoto,* Keisuke Fujimoto,* Koki Banno, Yutaka Majima, Masaki Takahashi, Shigeki Naka, Masahiro Hiramoto, Blue organic light-emitting diode with a turn-on voltage of 1.47 V, Nature Communications 2023, 14, 5494. (DOI: 10.1038/s41467-023-41208-7)
A press release on this work, “Blue OLED Emitting at the World’s Lowest Voltage: A Major Step Toward Energy-Saving, Long-Lasting OLED Displays” (in Japanese), was issued. https://www.shizuoka.ac.jp/news/detail.html?CN=9469
September 21, 2023: An article on this work appeared in the Nikkei (Nihon Keizai Shimbun).
https://www.nikkei.com/article/DGXZRSP662319_R20C23A9000000/
October 13, 2023: An article on this work appeared in Kagaku Shimbun (The Science News), No. 3941.
October 16, 2023: An article on this work appeared in the Nikkan Kogyo Shimbun.
October 17, 2023: An article on this work appeared on BBC News.
https://www.bbc.com/news/business-67076032
August 14, 2023
In collaboration with Prof. Tetsuya Sengoku, our study on the visible-light-induced reductive coupling of arylacetylenes with benzothiazole sulfones has been accepted for publication in The Journal of Organic Chemistry.
Tetsuya Sengoku*, Haruka Iwama, Takuma Shimotori, Keisuke Fujimoto, Toshiyasu Inuzuka, Koki Matsune, and Hidemi Yoda, Visible-Light-Induced Reductive Coupling of Arylacetylenes with Benzothiazole Sulfones, J. Org. Chem. 2023, 88, 12776−12782. (DOI: 10.1021/acs.joc.3c01554)
January 14, 2023
Our paper on the synthesis and emission properties of linear bis-anthracene multimers has been accepted for publication in European Journal of Organic Chemistry.
Keisuke Santo, Kentaro Uchida, Keisuke Fujimoto, Toshiyasu Inuzuka, Kazutaka Hirakawa, Tetsuya Sengoku, and Masaki Takahashi,* Synthesis of Highly Emissive Fluorophores Based on Multiply Stacked Anthracene Arrangement, Eur. J. Org. Chem. 2023, e202201479. (DOI: 10.1002/ejoc.202201479)
July 8, 2022
Our paper on the synthesis, properties, and reactivity of 7,12–Dihydrobenzo[de]indolo[3,2–b]quinoline has been accepted for publication in European Journal of Organic Chemistry.
Keisuke Fujimoto*, Kentaro Sasaki, Shota Yamagishi, Toshiyasu Inuzuka, Kazutaka Sanada, Masami Sakamoto, and Masaki Takahashi, 7,12-Dihydrobenzo[de]indolo[3,2-b]quinoline: Unique Reactivity and Redox Interconversion, Eur. J. Org. Chem. 2022, e202200564. (DOI: 10.1002/ejoc.202200564)
August 6, 2021
Our paper investigating the influence of N-substituents on the photovoltaic properties of perylene diimide dimers has been accepted for publication in Chemistry – A European Journal.
Seiichiro Izawa,* Kentaro Uchida, Mayuko Nakamura, Keisuke Fujimoto, Jérémy Roudin, Ji-Hyun Lee, Toshiyasu Inuzuka, Takumi Nakamura, Masami Sakamoto, Yasuo Nakayama, Masahiro Hiramoto, and Masaki Takahashi,* Influence of N-Substituents on Photovoltaic Properties of Singly Bay-Linked Dimeric Perylene Diimides, Chem. Eur. J. 2021, 27, 14081-14091. (DOI: 10.1002/chem.202102318)
May 20, 2021
Chemistry – A European Journal paper “Development of Novel Redox-Active Organic Dye Compounds” was featured in a press release.
https://www.shizuoka.ac.jp/news/detail.html?CN=7239
April 7, 2021
Our paper on the synthesis, properties, and reactivity of diazadibenzotetracene has been accepted for publication in Chemistry – A European Journal.
Keisuke Fujimoto*, Satoshi Takimoto, Shota Masuda, Toshiyasu Inuzuka, Kazutaka Sanada, Masami Sakamoto, and Masaki Takahashi, 5,11-Diazadibenzo[hi,qr]tetracene: Synthesis, Properties, and Reactivity toward Nucleophilic Reagents, Chem. Eur. J. 2021, 27, 8951-8955. (DOI: 10.1002/chem.202100944)
January 22, 2021
Our paper on curved perylene diimides fused with seven-membered rings has been accepted for publication in Chemistry – an Asian Journal.
Keisuke Fujimoto*, Seiichiro Izawa*, Ayumu Takahashi, Toshiyasu Inuzuka, Kazutaka Sanada, Masami Sakamoto, Yasuo Nakayama, Masahiro Hiramoto, and Masaki Takahashi, Curved Perylene Diimides Fused with Seven-Membered Rings, Chem. Asian J. 2021, 16, 690-695. (DOI: 10.1002/asia.202100066)
December 9, 2020
Our paper on an improved synthetic method for bay-monobrominated perylene diimides has been accepted for publication in ChemistrySelect.
Keisuke Fujimoto, Kentaro Uchida, Mayuko Nakamura, Toshiyasu Inuzuka, Naohiro Uemura, Masami Sakamoto, and Masaki Takahashi*, Improved Synthesis of Bay-Monobrominated Perylene Diimides, ChemistrySelect 2020, 5, 15031. (DOI: 10.1002/slct.202004432)
July 3, 2020
We filed a patent application on perylene compounds twisted by seven-membered rings at the bay positions.
Japanese Patent Application No. 2020-115747 (Perylene compounds and method for producing the same)
July 3, 2020
We filed a patent application on perylene dimer compounds directly linked at the bay position.
Japanese Patent Application No. 2020-115744 (Method for producing perylene dimer compounds, perylene dimer compounds, and organic thin-film solar cells)
May 1, 2020
Our review on the development of non-fullerene acceptors through bay-functionalization of perylene diimides has been accepted for publication in Materials. (Invited review)
Keisuke Fujimoto, Masaki Takahashi,* Seiichiro Izawa, Masahiro Hiramoto, Development of Perylene-Based Non-Fullerene Acceptors through Bay-Functionalization Strategy, Materials 2020, 13, 2148. (DOI: 10.3390/ma13092148)
February 28, 2020
An article on reducing voltage loss in organic solar cells appeared in Kagaku Shimbun (The Science News).
February 5, 2020
ChemPlusChem paper “Regioselective Bay-Position Modification of Perylenes toward Tailor-Made Synthesis of Acceptor Molecules for Organic Solar Cells” was featured in a press release.
Shizuoka University: https://www.shizuoka.ac.jp/news/detail.html?CN=6181
Institute for Molecular Science: https://www.ims.ac.jp/news/2020/02/05_4552.html
January 22, 2020
Our paper on the regioselective synthesis of multi-substituted perylenes and their application to organic solar cells has been accepted for publication in ChemPlusChem.
Keisuke Fujimoto, Seiichiro Izawa,* Yusaku Arikai, Shinya Sugimoto, Hirona Oue, Toshiyasu Inuzuka, Naohiro Uemura, Masami Sakamoto, Masahiro Hiramoto, and Masaki Takahashi*, Regioselective Bay-Functionalization of Perylenes Toward Tailor-Made Synthesis of Acceptor Materials for Organic Photovoltaics, ChemPlusChem 2020, 85, 285-293. (DOI: 10.1002/cplu.201900725)
July 4, 2019
Our paper on photon upconversion sensitized by reverse micellar assemblies has been accepted for publication in Langmuir.
Keisuke Fujimoto, Kyosuke Kawai, Shota Masuda, Toshihiro Mori, Takumi Aizawa, Toshiyasu Inuzuka, Takashi Karatsu, Masami Sakamoto, Shiki Yagai, Tetsuya Sengoku, Masaki Takahashi,* and Hidemi Yoda, Triplet-Triplet Annihilation Based Upconversion Sensitized by a Reverse Micellar Assembly of Amphiphilic Ruthenium Complexes, Langmuir 2019, 35, 9740-9746. (DOI: 10.1021/acs.langmuir.9b01433)
