城戸・笹部・千葉研究室博士２年の荒井博貴さんが愛知工業大学（Aichi Institute of Technology）で行われた2021年アジア有機エレクトロニクス国際会議（A-COE 2021）において、学生ポスター賞（Student Poster Award）を受賞しました！！城戸・笹部・千葉研究室では、荒井君の他に、博士３年の劉冠廷君（Mr. Guanting Liu）もポスター発表を行いました。

Asymmetric Spirobiacridine-based Delayed Fluorescence Emitters for High-performance Organic Light-Emitting Devices, Hiroki Arai, Hisahiro Sasabe,* Hisaki Tsuneyama, Kengo Kumada, Junji Kido*, 13th Asian Conference on Organic Electronics, P-14, Aichi, Japan, Sep. 2nd-4th, 2021. (Student Poster Award)

Abstract: Recently, researchers have focused on thermally activated delayed fluorescence (TADF). Among TADF emitters, a combination of triazine and acridine is a promising candidate for realizing high-efficiency organic light-emitting devices (OLEDs). However, simultaneous development of perfect horizontal orientation (Θ = 100%) and an external quantum efficiency (EQE) of over 40% is still challenging. Here, to obtain insights for further improvements of a triazine/acridine combination, we developed various asymmetric spirobiacridine (SBA)-based TADF emitters. Furthermore, we studied the substitution effects of the triazine acceptor unit on the photophysical properties, including molecular orientations and OLED performance. The corresponding OLED exhibited sky-blue emission with a high EQE of over 30%.