Nearly 100% exciton utilization in highly efficient red OLEDs based on dibenzothioxanthone acceptor

被引：17

作者：

Hu, Xiaoxiao ^{[1
,2
]}

Qin, Yuanyuan ^{[1
,2
]}

Li, Zhiyi ^{[1
,2
]}

Gao, Honglei ^{[1
,2
]}

Gao, Teng ^{[1
,2
]}

Liu, Guanhao ^{[1
,2
]}

Dong, Xiangyu ^{[1
,2
]}

Tian, Naxi ^{[1
,2
]}

Gu, Xiuxian ^{[1
,2
]}

Lee, Chun-Sing ^{[3
]}

Wang, Pengfei ^{[1
,2
]}

Wang, Ying ^{[1
,2
]}

机构：

[1] Chinese Acad Sci, Tech Inst Phys & Chem, Key Lab Photochem Convers & Optoelect Mat & CityU, Beijing 100190, Peoples R China

[2] Univ Chinese Acad Sci, Beijing 100049, Peoples R China

[3] City Univ Hong Kong, Ctr Super Diamond & Adv Films COSDAF, Hong Kong, Peoples R China

来源：

CHINESE CHEMICAL LETTERS | 2022年 / 33卷 / 10期

基金：

中国国家自然科学基金;

关键词：

Red light; Organic light-emitting diode; Thermally activated delayed fluorescence; Exciton utilization; Locally excited triplet state; ACTIVATED DELAYED FLUORESCENCE; LIGHT-EMITTING-DIODES; MOLECULAR DESIGN; ELECTROLUMINESCENCE; EMITTERS; SINGLET; GREEN;

D O I：

10.1016/j.cclet.2021.12.047

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Improving the utilization of excitons has always been an important topic for the development of electroluminescence devices. In this work, we designed and synthesized three red TADF emitters TPA-DBT12, TPA-DBT3 and DTPA-DBT by employing dibenzothioxanthone (DBT) acceptor framework to stabilize the locally excited triplet state to participate in the reverse intersystem crossing (RISC) process. The fast RISC process and singlet radiation decay process gave rise to evidently enhanced exciton utilization. All of the red OLEDs based on these materials showed maximum EQE over 11% and high exciton utilization close to 100%. This work not only extend the acceptor framework for red materials but also provide a new perspective for the design of highly efficient red TADF materials with 100% exciton utilization by managing locally excited triplet state. (C) 2022 Published by Elsevier B.V. on behalf of Chinese Chemical Society and Institute of Materia Medica, Chinese Academy of Medical Sciences.

引用

页码：4645 / 4648

页数：4

共 42 条

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