3,3′-Bicarbazole-Based Host Materials for High-Efficiency Blue Phosphorescent OLEDs with Extremely Low Driving Voltage

Authors

  • Hisahiro Sasabe,

    Corresponding author
    1. Department of Organic Device Engineering and Research Center for Organic Electronics (ROEL), Yamagata university, 4-3-16 Johnan, Yonezawa, Yamagata 992-8510, Japan
    • Department of Organic Device Engineering and Research Center for Organic Electronics (ROEL), Yamagata university, 4-3-16 Johnan, Yonezawa, Yamagata 992-8510, Japan.
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  • Naoki Toyota,

    1. Department of Organic Device Engineering, Yamagata University, 4-3-16 Jonan, Yonezawa, Yamagata 992-8510, Japan
    2. Research Center for Organic Electronics (ROEL), Yamagata University, 4-3-16 Jonan, Yonezawa, Yamagata 992-8510, Japan
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  • Hiromi Nakanishi,

    1. Department of Organic Device Engineering, Yamagata University, 4-3-16 Jonan, Yonezawa, Yamagata 992-8510, Japan
    2. Research Center for Organic Electronics (ROEL), Yamagata University, 4-3-16 Jonan, Yonezawa, Yamagata 992-8510, Japan
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  • Tasuku Ishizaka,

    1. Department of Organic Device Engineering, Yamagata University, 4-3-16 Jonan, Yonezawa, Yamagata 992-8510, Japan
    2. Research Center for Organic Electronics (ROEL), Yamagata University, 4-3-16 Jonan, Yonezawa, Yamagata 992-8510, Japan
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  • Yong-Jin Pu,

    1. Department of Organic Device Engineering, Yamagata University, 4-3-16 Jonan, Yonezawa, Yamagata 992-8510, Japan
    2. Research Center for Organic Electronics (ROEL), Yamagata University, 4-3-16 Jonan, Yonezawa, Yamagata 992-8510, Japan
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  • Junji Kido

    Corresponding author
    1. Department of Organic Device Engineering and Research Center for Organic Electronics (ROEL), Yamagata university, 4-3-16 Johnan, Yonezawa, Yamagata 992-8510, Japan
    • Department of Organic Device Engineering and Research Center for Organic Electronics (ROEL), Yamagata university, 4-3-16 Johnan, Yonezawa, Yamagata 992-8510, Japan.
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Abstract

original image

Four types of functionalized 3,3′-bicarbazole derivatives are prepared and investigated as a host material for blue phosphorescent OLEDs. By using a 3,3′-bicarbazole derivative/FIrpic film as an emissive layer, high power efficiency of 46 lm W−1 (45 cd A−1, EQE 20%) with an extremely low driving voltage at 3.1 V is obtained at 100 cd m−2.

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