Deuterium Renders Fast Risc and Low Non-Radiation Decays of TADF Emitters

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

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Author(s)

  • Yuanyuan Qin
  • Xin Xie
  • Zhi Pang
  • Guanhao Liu
  • Xiangyu Dong
  • Shaogang Shen
  • Yaogang Zhang
  • Yuanping Yi
  • Pengfei Wang
  • Ying Wang

Detail(s)

Original languageEnglish
Pages (from-to)2300981
Journal / PublicationAdvanced Optical Materials
Publication statusOnline published - 31 Jul 2023

Abstract

A simple strategy to simultaneously achieve fast reverse intersystem crossing (RISC) and low non-radiative decay rates in thermally activated delayed fluorescence (TADF) emitters is still lacking. Here, the green TADF emitters containing aromatic ketones and prepared D-Ph and D-PhCz containing different amounts of deuterium are deuterated to study the mechanism of deuterium on the performance improvement of TADF devices. Due to the heavy atom effect of deuterium, the non-radiative transition rate constant (knr) of D-Ph and D-PhCz decreases. Most importantly, deuterium reduces the reorganization energy (λ) of (T1-S1), which greatly improves the reverse intersystem crossing rate constant (kRISC) and the exciton utilization efficiency. The results show that the external quantum efficiency of D-Ph and D-PhCz increases to 25.69% and 24.92%, respectively. This study provides a simple and efficient strategy for reducing non-radiative energy loss and increasing kRISC to achieve high-performance TADF emitters. © 2023 Wiley-VCH GmbH.

Research Area(s)

  • deuterium, non-radiative energy loss, reorganization energy, reverse intersystem crossing, thermally activated delayed fluorescence

Citation Format(s)

Deuterium Renders Fast Risc and Low Non-Radiation Decays of TADF Emitters. / Qin, Yuanyuan; Xie, Xin; Pang, Zhi et al.
In: Advanced Optical Materials, 31.07.2023, p. 2300981.

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