Top-emitting thermally activated delayed fluorescence organic light-emitting devices with weak light-matter coupling

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

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  • Chunxiu Zang
  • Shihao Liu
  • Mengxin Xu
  • Ruifang Wang
  • Jiaming Zhang
  • Hui Wang
  • Letian Zhang
  • Wenfa Xie


Original languageEnglish
Article number116
Journal / PublicationLight: Science and Applications
Online published3 Jun 2021
Publication statusPublished - 2021



Resonance interaction between a molecular transition and a confined electromagnetic field can lead to weak or strong light-matter coupling. Considering the substantial exciton–phonon coupling in thermally activated delayed fluorescence (TADF) materials, it is thus interesting to explore whether weak light-matter coupling can be used to redistribute optical density of states and to change the rate of radiative decay. Here, we demonstrate that the emission distribution of TADF emitters can be reshaped and narrowed in a top-emitting organic light-emitting device (OLED) with a weakly coupled microcavity. The Purcell effect of weak microcavity is found to be different for TADF emitters with different molecular orientations. We demonstrate that radiative rates of the TADF emitters with vertical orientation can be substantial increased in weakly coupled organic microcavity. These observations can enhance external quantum efficiencies, reduce efficiency roll-off, and improve color-purities of TADF OLEDs, especially for emitters without highly horizontal orientation.

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