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Resonance hosts for high efficiency solution-processed blue and white electrophosphorescent devices

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Abstract

The exploration of high-performance solution-processible host materials for blue and white electrophosphorescent devices is a key and fundamental challenge in the ongoing development of organic semiconductors. Herein, two solution-processible resonance host materials with self-adaptive characteristics are delicately designed and constructed. Because of the dynamic tautomerization upon resonance variation, these smart hosts show self-adaptive and selectively enhanced charge carrier flux at high triplet energy levels. Conferred by the resonance molecules, solution-processed blue and white devices exhibit excellent maximum current efficiencies (CEs) of 29.8 and 57.3 cd A−1, and external quantum efficiencies (EQEs) up to 14.5% and 23.5%, respectively. Our works highlight the significant progress of the solution-processed phosphorescent organic light-emitting diodes (PhOLEDs) using resonance host molecules, potentially furnishing a leap forward in constructing advanced organic semiconductors for next-generation optoelectronic devices.

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Acknowledgements

This work was supported by the National Natural Science Foundation of China (21704042, 21604039, 61875090, 51873159, 91833306, 21674049), the Six Talent Plan of Jiangsu Province (XCL-049), 1311 Talents Program of Nanjing University of Posts and Telecommunications (Dingfeng), the Natural Science Fund for Colleges and Universities in Jiangsu Province (17KJB150017), China Postdoctoral Science Foundation Funded Project (2018M642284), the Nanjing University of Posts and Telecommunications Start-up Fund (NUPTSF) (NY219007, NY217140), and the Science and Technology Innovation Project for Overseas Students in Nanjing.

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  1. These authors contributed equally to this work.

Authors and Affiliations

  1. Key Laboratory for Organic Electronics and Information Displays & Jiangsu Key Laboratory for Biosensors, Institute of Advanced Materials (IAM), Nanjing University of Posts & Telecommunications, Nanjing, 210023, China

    Huanhuan Li, Jibiao Jin, Yuan Xiang, Ying Zhang, Ye Tao, Mingguang Li, Wei Huang & Runfeng Chen

  2. Sauvage Center for Molecular Sciences, Hubei Key Lab on Organic and Polymeric Optoelectronic Materials, Department of Chemistry, Wuhan University, Wuhan, 430072, China

    Qin Xue & Guohua Xie

  3. Frontiers Science Center for Flexible Electronics (FSCFE), Shaanxi Institute of Flexible Electronics (SIFE) & Shaanxi Institute of Biomedical Materials and Engineering (SIBME), Northwestern Polytechnical University (NPU), Xi’an, 710072, China

    Wei Huang

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  1. Huanhuan Li
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  2. Jibiao Jin
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  3. Yuan Xiang
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  4. Ying Zhang
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Correspondence to Ye Tao, Guohua Xie or Runfeng Chen.

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Li, H., Jin, J., Xiang, Y. et al. Resonance hosts for high efficiency solution-processed blue and white electrophosphorescent devices. Sci. China Chem. 63, 1645–1651 (2020). https://doi.org/10.1007/s11426-020-9823-7

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  • DOI: https://doi.org/10.1007/s11426-020-9823-7

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