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

Chunxiu Zang; Shihao Liu; Mengxin Xu; Ruifang Wang; Chen Cao; Zelin Zhu; Jiaming Zhang; Hui Wang; Letian Zhang; Wenfa Xie; Chun-Sing Lee

doi:10.1038/s41377-021-00559-w

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

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- Top-emitting thermally activated delayed fluorescence organic light-emitting devices with weak light-matter coupling
- Light: Science & Applications Vol. 10, Issue 7, Pages: 1257-1266(2021)
- Affiliations：
  
  1.State key Laboratory of Integrated Optoelectronics, College of Electronics Science and Engineering, Jilin University, 130012 Changchun, China
  2.Center of Super-Diamond and Advanced Films (COSDAF) and Department of Chemistry, City University of Hong Kong, 999077 Hong Kong SAR, China
- Author bio：
  
  Shihao Liu (liushihao@jlu.edu.cn)
  Wenfa Xie (xiewf@jlu.edu.cn)
  Chun-Sing Lee (apcslee@cityu.edu.hk)
- Funds：
- DOI：10.1038/s41377-021-00559-w
  CLC：
- Published：31 July 2021，
  
  Published Online：03 June 2021，
  
  Received：06 March 2021，
  
  Revised：06 May 2021，
  
  Accepted：20 May 2021
- Accepted：
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Zang, C. X. et al. Top-emitting thermally activated delayed fluorescence organic light-emitting devices with weak light-matter coupling. Light: Science & Applications, 10, 1257-1266 (2021).
DOI：

Zang, C. X. et al. Top-emitting thermally activated delayed fluorescence organic light-emitting devices with weak light-matter coupling. Light: Science & Applications, 10, 1257-1266 (2021). DOI： 10.1038/s41377-021-00559-w.

摘要

Abstract

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.

关键词

Keywords

references

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