Managing Locally Excited and Charge-Transfer Triplet States to Facilitate Up-Conversion in Red TADF Emitters That Are Available for Both Vacuum- and Solution-Processes

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

13 Scopus Citations
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Author(s)

  • Jia-Xiong Chen
  • Kai Wang
  • Dianming Sun
  • Xiao-Chun Fan
  • Xiang Zhang
  • Ming Zhang
  • Yi-Zhong Shi
  • Jia Yu
  • Feng-Xia Geng
  • Xiao-Hong Zhang

Detail(s)

Original languageEnglish
Pages (from-to)2478-2484
Journal / PublicationAngewandte Chemie - International Edition
Volume60
Issue number5
Online published20 Oct 2020
Publication statusPublished - 1 Feb 2021

Abstract

Developing red thermally activated delayed fluorescence (TADF) emitters for high-performance OLEDs is still facing great challenge. Herein, three red TADF emitters, pDBBPZ-DPXZ, pDTBPZ-DPXZ, and oDTBPZ-DPXZ, are designed and synthesized with same donor–acceptor (D-A) backbone with different peripheral groups attaching on the A moieties. Their lowest triplet states change from locally excited to charge transfer character leading to significantly enhance reverse intersystem crossing process. In particular, oDTBPZ-DPXZ exhibits efficient TADF feature and exciton utilization. It not only achieves an external quantum efficiency (EQE) of 20.1 % in red vacuum-processed OLED, but also realize a high EQE of 18.5 % in a solution-processed OLED, which is among the best results in solution-processed red TADF OLEDs. This work provides an effective strategy for designing red TADF molecules by managing energy level alignments to facilitate the up-conversion process and thus enhance exciton harvesting.

Research Area(s)

  • charge-transfer triplet state, locally excited triplet state, solution-processed OLED, thermally activated delayed fluorescence, vacuum-deposited OLED

Citation Format(s)

Managing Locally Excited and Charge-Transfer Triplet States to Facilitate Up-Conversion in Red TADF Emitters That Are Available for Both Vacuum- and Solution-Processes. / Chen, Jia-Xiong; Xiao, Ya-Fang; Wang, Kai; Sun, Dianming; Fan, Xiao-Chun; Zhang, Xiang; Zhang, Ming; Shi, Yi-Zhong; Yu, Jia; Geng, Feng-Xia; Lee, Chun-Sing; Zhang, Xiao-Hong.

In: Angewandte Chemie - International Edition, Vol. 60, No. 5, 01.02.2021, p. 2478-2484.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review