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Through-space charge transfer blue polymers containing acridan donor and oxygen-bridged triphenylboron acceptor for highly efficient solution-processed organic light-emitting diodes

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Abstract

Three kinds of through-space charge transfer (TSCT) blue polymers containing non-conjugated polystyrene backbone together with spatially-separated acridan donor and oxygen-bridged triphenylboron acceptors having different substituents of tert-butyl, hydrogen and fluorine are designed and synthesized. The designed TSCT blue polymers possess photoluminescence quantum yields up to 70% in solid-state film, single-triplet energy splitting below 0.1 eV, and typical thermally activated delayed fluorescence (TADF) effect. Meanwhile, the resulting polymers exhibit aggregation-induced emission (AIE) effect with emission intensity increased by up to ~27 folds from solution to aggregation state. By changing the substituent of acceptors to tune the charge transfer strength, blue emission with peaks from 444 to 480 nm can be realized for the resulting polymers. Solution-processed organic light-emitting diodes based on the polymers exhibit excellent device performance with Commission Internationale de L’Eclairage (CIE) coordinates of (0.16, 0.27), together with the maximum luminous efficiency of 30.7 cd A-1 and maximum external quantum efficiency of 15.0%, which is the best device efficiency for blue TADF polymers.

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Acknowledgements

This work was supported by the National Natural Science Foundation of China (51833009, 21975247, 51573182), the National Program on Key Basic Research Project of China (2015CB655000) and the Youth Innovation Promotion Association of Chinese Academy of Sciences (2015180).

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Authors and Affiliations

  1. State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun, 130022, China

    Fan Chen, Jun Hu, Xingdong Wang, Shiyang Shao, Lixiang Wang, Xiabin Jing & Fosong Wang

  2. School of Applied Chemistry and Engineering, University of Science and Technology of China, Hefei, 230026, China

    Fan Chen, Jun Hu & Lixiang Wang

Authors
  1. Fan Chen
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  2. Jun Hu
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  3. Xingdong Wang
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  4. Shiyang Shao
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  5. Lixiang Wang
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  6. Xiabin Jing
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  7. Fosong Wang
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Correspondence to Shiyang Shao or Lixiang Wang.

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11426_2020_9750_MOESM1_ESM.pdf

Through-space charge transfer blue polymers containing acridan donor and oxygen-bridged triphenylboron acceptor for highly efficient solution-processed organic light-emitting diodes

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Chen, F., Hu, J., Wang, X. et al. Through-space charge transfer blue polymers containing acridan donor and oxygen-bridged triphenylboron acceptor for highly efficient solution-processed organic light-emitting diodes. Sci. China Chem. 63, 1112–1120 (2020). https://doi.org/10.1007/s11426-020-9750-9

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