期刊
CHINESE CHEMICAL LETTERS
卷 33, 期 10, 页码 4645-4648出版社
ELSEVIER SCIENCE INC
DOI: 10.1016/j.cclet.2021.12.047
关键词
Red light; Organic light-emitting diode; Thermally activated delayed fluorescence; Exciton utilization; Locally excited triplet state
资金
- National Natural Science Foundation of China [21772209]
- National Program for Support of Top-notch Young Professionals
In this study, three red TADF emitters were designed and synthesized, and the utilization of excitons was improved by stabilizing the locally excited triplet state using a dibenzothioxanthone acceptor framework. The red OLEDs based on these materials exhibited high quantum efficiency and close to 100% exciton utilization.
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.
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