Characterizing the Conformational Distribution in an Amorphous Film of an Organic Emitter and Its Application in a “Self-Doping” Organic Light-Emitting Diode

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

21 Scopus Citations
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Author(s)

  • Yi-Zhong Shi
  • Kai Wang
  • Shao-Li Zhang
  • Xiao-Chun Fan
  • Youichi Tsuchiya
  • Yi-Ting Lee
  • Gao-Le Dai
  • Jia-Xiong Chen
  • Cai-Jun Zheng
  • Shi-Yun Xiong
  • Xue-Mei Ou
  • Jia Yu
  • Jian-Sheng Jie
  • Chihaya Adachi
  • Xiao-Hong Zhang

Detail(s)

Original languageEnglish
Pages (from-to)25878-25883
Journal / PublicationAngewandte Chemie - International Edition
Volume60
Issue number49
Online published28 Sep 2021
Publication statusPublished - 1 Dec 2021

Abstract

The conformational distribution and mutual interconversion of thermally activated delayed fluorescence (TADF) emitters significantly affect the exciton utilization. However, their influence on the photophysics in amorphous film states is still not known due to the lack of a suitable quantitative analysis method. Herein, we used temperature-dependent time-resolved photoluminescence spectroscopy to quantitatively measure the relative populations of the conformations of a TADF emitter for the first time. We further propose a new concept of “self-doping” for realizing high-efficiency nondoped OLEDs. Interestingly, this “compositionally” pure film actually behaves as a film with a dopant (quasi-equatorial form) in a matrix (quasi-axial form). The concentration-induced quenching that may occur at high concentrations is thus expected to be effectively relieved. The “self-doping” OLED prepared with the newly developed TADF emitter TP2P-PXZ as a neat emitting layer realizes a high maximum external quantum efficiency of 25.4 % and neglectable efficiency roll-off.

Research Area(s)

  • conformational populations, fluorescence, organic light-emitting diodes, self-doping

Citation Format(s)

Characterizing the Conformational Distribution in an Amorphous Film of an Organic Emitter and Its Application in a “Self-Doping” Organic Light-Emitting Diode. / Shi, Yi-Zhong; Wang, Kai; Zhang, Shao-Li et al.

In: Angewandte Chemie - International Edition, Vol. 60, No. 49, 01.12.2021, p. 25878-25883.

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