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De Novo Design of Silicon-Bridged Molecule Towards a Bipolar Host: All-Phosphor White Organic Light-Emitting Devices Exhibiting High Efficiency and Low Efficiency Roll-Off

Authors

  • Shaolong Gong,

    1. Department of Chemistry, Hubei Key Lab on Organic and Polymeric Optoelectronic Materials, Wuhan University, Wuhan 430072 (PR China)
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  • Yonghua Chen,

    1. State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022 (PR China)
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  • Chuluo Yang,

    Corresponding author
    1. Department of Chemistry, Hubei Key Lab on Organic and Polymeric Optoelectronic Materials, Wuhan University, Wuhan 430072 (PR China)
    • Department of Chemistry, Hubei Key Lab on Organic and Polymeric Optoelectronic Materials, Wuhan University, Wuhan 430072 (PR China)
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  • Cheng Zhong,

    1. Department of Chemistry, Hubei Key Lab on Organic and Polymeric Optoelectronic Materials, Wuhan University, Wuhan 430072 (PR China)
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  • Jingui Qin,

    1. Department of Chemistry, Hubei Key Lab on Organic and Polymeric Optoelectronic Materials, Wuhan University, Wuhan 430072 (PR China)
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  • Dongge Ma

    Corresponding author
    1. State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022 (PR China)
    • State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022 (PR China).
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Abstract

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A molecular design strategy for a bipolar host material is demonstrated by incorporating both electron donor and electron acceptor into a silicon-bridged structure. A two-color, all phosphor and single-emitting-layer white OLED hosted by the new bipolar compound p-BISiTPA is fabricated. The device displays a high efficiency, with ηc, max of 51.8 cd A−1, ηp, max of 42.7 lm W−1 and ηext, max of 19.1%. Furthermore, the ηext is still as high as 17.4% at the luminance of 1000 cd m−2, with a rather low roll-off value of 8.9%.

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