Thermally activated triplet exciton release for highly efficient tri-mode organic afterglow

Jibiao Jin, He Jiang, Qingqing Yang, Lele Tang, Ye Tao, Yuanyuan Li, Runfeng Chen (), Chao Zheng, Quli Fan, Kenneth Yin Zhang, Qiang Zhao and Wei Huang ()
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Jibiao Jin: Nanjing University of Posts & Telecommunications
He Jiang: Nanjing University of Posts & Telecommunications
Qingqing Yang: Nanjing University of Posts & Telecommunications
Lele Tang: Nanjing University of Posts & Telecommunications
Ye Tao: Nanjing University of Posts & Telecommunications
Yuanyuan Li: Nanjing University of Posts & Telecommunications
Runfeng Chen: Nanjing University of Posts & Telecommunications
Chao Zheng: Nanjing University of Posts & Telecommunications
Quli Fan: Nanjing University of Posts & Telecommunications
Kenneth Yin Zhang: Nanjing University of Posts & Telecommunications
Qiang Zhao: Nanjing University of Posts & Telecommunications
Wei Huang: Nanjing University of Posts & Telecommunications

Nature Communications, 2020, vol. 11, issue 1, 1-9

Abstract: Abstract Developing high-efficient afterglow from metal-free organic molecules remains a formidable challenge due to the intrinsically spin-forbidden phosphorescence emission nature of organic afterglow, and only a few examples exhibit afterglow efficiency over 10%. Here, we demonstrate that the organic afterglow can be enhanced dramatically by thermally activated processes to release the excitons on the stabilized triplet state (T1*) to the lowest triplet state (T1) and to the singlet excited state (S1) for spin-allowed emission. Designed in a twisted donor–acceptor architecture with small singlet-triplet splitting energy and shallow exciton trapping depth, the thermally activated organic afterglow shows an efficiency up to 45%. This afterglow is an extraordinary tri-mode emission at room temperature from the radiative decays of S1, T1, and T1*. With the highest afterglow efficiency reported so far, the tri-mode afterglow represents an important concept advance in designing high-efficient organic afterglow materials through facilitating thermally activated release of stabilized triplet excitons.

Date: 2020
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DOI: 10.1038/s41467-020-14669-3

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