群馬大学山路稔准教授 (Prof. Minoru Yamaji) とのジフルオロボロン錯体の有機ELへの応用に関する共同研究論文「Unique solid-state emission behaviors of aromatic difluoroboronated β-diketones as an emitter in organic light-emitting devices」が Wiley の Chemistry An Asian Journal (IF: 4.083) にアクセプトされました。一緒に研究を進めてくれた卒業生の佐々木香菜子さん (Ms Kanako Sasaki)、大沼夏樹君 (Mr Natsuki Onuma)、M1 渡邊大貴君 (Mr Taiki Watanabe)、M2 中尾晃平君 (Mr Kohei Nakao)、おめでとうございます！
Title: Unique solid-state emission behaviors of aromatic difluoroboronated β-diketones as an emitter in organic light-emitting devices
By Hisahiro Sasabe*, Kanako Sasaki, Michitaka Mamiya, Yurie Suwa, Taiki Watanabe, Natsuki Onuma, Kohei Nakao, Minoru Yamaji*, Junji Kido*, Chemistry An Asian Journal, accepted.
Abstract: Aromatic difluoroboronated b-diketones (BF2DKs) are a well-known class of luminescent organic materials that exhibit high photoluminescent quantum efficiency and unique aggregation-dependent fluorescence behavior. However, there have been only a few reports on their use in solid-state electronic devices such as organic light-emitting diodes (OLEDs). In this work, we investigated the solid-state properties and OLED performances of a series of p-extended BF2DKs that previously exhibited intense fluorescence in the solution state. The BF2DKs formed exciplexes with a carbazole derivative and exhibited thermally activated delayed fluorescence behavior, realizing orange electroluminescence with a peak external quantum efficiency of 10% that is apparently exceeded the theoretical efficiency limit of conventional fluorescent OLEDs (7.5%) assuming a light out-coupling factor of 30%.
