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

Xiaoxiao Hu, Yuanyuan Qin, Zhiyi Li, Honglei Gao, Teng Gao, Guanhao Liu, Xiangyu Dong, Naxi Tian, Xiuxian Gu, Chun-Sing Lee, Pengfei Wang, Ying Wang*

*Corresponding author for this work

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review

17 Citations (Scopus)

Abstract

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.
Original languageEnglish
Pages (from-to)4645-4648
JournalChinese Chemical Letters
Volume33
Issue number10
Online published24 Dec 2021
DOIs
Publication statusPublished - Oct 2022

Research Keywords

  • Exciton utilization
  • Locally excited triplet state
  • Organic light-emitting diode
  • Red light
  • Thermally activated delayed fluorescence

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