ニュース《2025年》

【論文受理】博士後期課程修了の熊田くんと M2 三村くんの「電気化学的に堅牢なケイ素架橋青色 MR-TADF 発光材料の論文」が Wiley の Advanced Optical Materials (IF: 7.3) に受理！

2025/11/10

笹部研究室の博士後期課程修了生の熊田くんと M2 三村くんの「電気化学的に堅牢なケイ素架橋青色 MR-TADF 発光材料の論文」が Wiley の Advanced Optical Materials (IF: 7.3) に受理されました！

本研究は、NEDO 官民による若手研究者発掘支援事業 (21502128-0)、JSPS 科研費（基盤研究B 23H02032、特別研究員奨励費24KJ0451）、岩谷科学技術特別研究助成の支援を受けたものです。理研の夫勇進先生には量子化学計算のご指導をいただきました。ご指導ありがとうございました。

Title: Silicon-Bridged Cyclic Multi-Resonance TADF Emitters Enable Enhanced 
Electrochemical Stability and High Performance in Blue Organic 
Light-Emitting Devices

By Kengo Kumada,+ Ryunosuke Mimura,+ Haruaki Shiga, Yuki Sagae, Hiroto 
Sato, Yudai Chiba, Haruki Nemma, Daisuke Yokoyama, Junji Kido, Hisahiro 
Sasabe*, Advanced Optical Materials, accepted.
+These two authors contributed equally

Abstract: Boron-based multi-resonance thermally activated delayed 
fluorescence (MR-TADF) emitters have attracted considerable attention as a 
promising approach for achieving high color purity and nearly 100% internal 
quantum efficiency in organic light-emitting devices (OLEDs). Although many 
MR-TADF emitters have been developed to date, achieving high external 
quantum efficiency (EQE), it remains challenging to simultaneously realize 
long operational lifetimes, especially in blue OLEDs with CIEy <0.20. In 
this study, we designed novel blue MR-TADF emitters named DPSi-R-BN 
derivatives to address this issue. By introducing a cross-linked structure 
into the DABNA-1 skeleton via a silicon bridge and enhancing the bond 
dissociation energy (BDE) of the fragile carbon–nitrogen bond, we 
successfully improved the electrochemical stability of the emitters. The 
resulting blue OLED exhibited an EQE of 24.5%, a narrow full width at half 
maximum of 24 nm, and CIE coordinates of (0.137, 0.175). Most notably, the 
device showed a 1.4‑fold improvement in operational lifetime (LT80 = 
373/111 h at 500/1000 cd/m2) compared to the conventional t-DABNA-based 
device.

https://hisahirosasabe.yz.yamagata-u.ac.jp/archives/501
 

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