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Asymmetric Thermally Activated Delayed Fluorescence Materials Rendering High-performance OLEDs Through both Thermal Evaporation and Solution-processing

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Chemical Research in Chinese Universities Aims and scope

Abstract

Exploring high-efficiency thermally activated delayed fluorescence(TADF) materials is of great importance regarding to organic light-emitting diode(OLED). Herein, we present a design strategy for developing asymmetric TADF materials based on a diphenyl sulfone-phenoxazine structure, resulting in efficient TADF emitters(CzPXZ and t-CzPXZ) with aggregation-induced emission properties, while t-CzPXZ is modified with tert-butyl groups. The two compounds exhibit high solid-state luminescence, efficient TADF, and significantly impressive device performances by both thermal evaporation and solution processing. For an instance, CzPXZ and t-CzPXZ enable the thermally-evaporated OLEDs with high external quantum efficiencies(EQEs) of over 20%. Meanwhile, t-CzPXZ allows the solution-processed device with a high EQE of 16.3% with low-efficiency roll-off, attributing to the enhanced molecular solubility and suppressed excitons quenching through tert-butyl modification on t-CzPXZ. The results reveal that the proposed asymmetric structure is a promising approach for developing high-efficiency TADF materials and OLEDs.

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Acknowledgements

This work was supported by the National Natural Science Foundation of China(Nos.52073316, 51733010, 51973239) and the Science and Technology Planning Project of Guangzhou City, China(No.202102020951).

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Authors and Affiliations

  1. State Key Laboratory of OEMT, School of Materials Science and Engineering, Sun Yat-sen University, Guangzhou, 510275, P. R. China

    Shiyuan Gao, Juan Zhao & Zhenguo Chi

  2. State Key Laboratory of OEMT, School of Chemistry, Sun Yat-sen University, Guangzhou, 510275, P. R. China

    Xiaojie Chen, Xiangyu Ge, Zhu Chen & Zhenguo Chi

Authors
  1. Shiyuan Gao
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  2. Xiaojie Chen
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  3. Xiangyu Ge
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  4. Zhu Chen
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  5. Juan Zhao
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  6. Zhenguo Chi
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Correspondence to Juan Zhao or Zhenguo Chi.

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The authors declare no conflicts of interest.

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40242_2022_2111_MOESM1_ESM.pdf

Asymmetric Thermally Activated Delayed Fluorescence Materials Rendering High-performance OLEDs Through both Thermal Evaporation and Solution-processing

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Gao, S., Chen, X., Ge, X. et al. Asymmetric Thermally Activated Delayed Fluorescence Materials Rendering High-performance OLEDs Through both Thermal Evaporation and Solution-processing. Chem. Res. Chin. Univ. 38, 1526–1531 (2022). https://doi.org/10.1007/s40242-022-2111-0

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  • DOI: https://doi.org/10.1007/s40242-022-2111-0

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