The regioisomeric effect on the excited-state fate leading to room-temperature phosphorescence or thermally activated delayed fluorescence in a dibenzophenazine-cored donor?acceptor?donor system
The regioisomeric effect on the excited-state fate leading to room-temperature phosphorescence or thermally activated delayed fluorescence in a dibenzophenazine-cored donor?acceptor?donor system
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二苯并吩嗪核供体-受体-供体系统中激发态命运的区域异构效应导致室温磷光或热激活延迟荧光
DOI：
10.1039/d1tc05730h
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发表时间：
2022
影响因子：
6.4
通讯作者：
Takeda Youhei
中科院分区：
文献类型：
--
作者：
Hosono Takumi;Decarli Nicolas Oliveira;Crocomo Paola Zimmermann;Goya Tsuyoshi;de Sousa Leonardo Evaristo;Tohnai Norimitsu;Minakata Satoshi;de Silva Piotr;Data Przemyslaw;Takeda Youhei
探索热激活延迟荧光(TADF)和室温磷光(RTP)之间的转换设计原理是开发三重态光功能有机材料的重要基础研究。本文系统地研究了D-A-D(D-A-D)分子骨架(A=二苯并[a，j]吩嗪；D=二氢吩嗪)中的区域异构体和取代基对其激发态命运的影响。研究表明，区域异构化明显影响D-A-D化合物的发射行为。此外，根据所用主机的不同，TADF、双TADF和RTP以及双RTP也有明显差异。此外，用所开发的发射体制造的有机电致发光二极管(OLED)对于基于RTP的OLED获得了高达7.4%的外量子效率(EQE)。
Exploring the design principle for switching between thermally activated delayed fluorescence (TADF) and room temperature phosphorescence (RTP) is a fundamentally important research to develop triplet-mediated photofunctional organic materials. Herein systematic studies on the regioisomeric and substituent effects in a twisted donor–acceptor–donor (D–A–D) molecular scaffold (A = dibenzo[a,j]phenazine; D = dihydrophenazasiline) on the fate of its excited state have been performed. The study revealed that regioisomerism clearly affects the emission behavior of the D–A–D compounds. Moreover, distinct differences in TADF, dual TADF & RTP, and dual RTP were observed, depending on the host used. Furthermore, organic light-emitting diodes (OLEDs) fabricated with the developed emitters achieved high external quantum efficiencies (EQEs) of up to 7.4% for RTP-based OLEDs.