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Efficient Persistent Room Temperature Phosphorescence in Organic Amorphous Materials under Ambient Conditions

Authors

  • Shuzo Hirata,

    Corresponding author
    1. Department of Polymer Science and Organic Materials Engineering, Tokyo Institute of Technology, 2-12-1, Meguro, Tokyo 152-8552, Japan
    • Department of Polymer Science and Organic Materials Engineering, Tokyo Institute of Technology, 2-12-1, Meguro, Tokyo 152-8552, Japan
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  • Kenro Totani,

    1. Division of Applied Chemistry, Graduate School of Engineering, Tokyo University of Agriculture and Technology, 2-24-16 Naka, Koganei, Tokyo 184-8588, Japan
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  • Junxiang Zhang,

    1. Center for Organic Photonics and Electronics (COPE) and School of Chemistry and Biochemistry, Georgia Institute of Technology, 901 Atlantic Drive, Atlanta, GA 30332-0400, USA
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  • Takashi Yamashita,

    1. Pure and Applied Chemistry, Science and Technology, Tokyo University of Science, 2641 Yamazaki, Noda, Chiba 278-8510, Japan
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  • Hironori Kaji,

    1. Institute for Chemical Research, Kyoto University, Uji, Kyoto 611-0011, Japan
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  • Seth R. Marder,

    1. Center for Organic Photonics and Electronics (COPE) and School of Chemistry and Biochemistry, Georgia Institute of Technology, 901 Atlantic Drive, Atlanta, GA 30332-0400, USA
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  • Toshiyuki Watanabe,

    Corresponding author
    1. Division of Applied Chemistry, Graduate School of Engineering, Tokyo University of Agriculture and Technology, 2-24-16 Naka, Koganei, Tokyo 184-8588, Japan
    • Division of Applied Chemistry, Graduate School of Engineering, Tokyo University of Agriculture and Technology, 2-24-16 Naka, Koganei, Tokyo 184-8588, Japan
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  • Chihaya Adachi

    Corresponding author
    1. Center for Organic Photonics and Electronics Research (OPERA), Kyushu University, 744 Motooka, Nishi, Fukuoka 819-0395, Japan
    • Center for Organic Photonics and Electronics Research (OPERA), Kyushu University, 744 Motooka, Nishi, Fukuoka 819-0395, Japan.
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Abstract

Persistent emission with a long lifetime (>1 s) from organic materials can only be observed at a low temperature, because of the significant nonradiative deactivation pathway that occurs at room-temperature (RT). If organic materials with persistent RT emission in air could be developed, they could potentially be utilized for a variety of applications. Here, organic host-guest materials with efficient persistent RT phosphorescence (RTP) are developed by minimizing the nonradiative deactivation pathway of triplet excitons. The nonradiative deactivation pathway is dependent on both nonradiative deactivation of the guest and quenching by diffusional motion of the host. The rigidity and oxygen barrier properties of the steroidal compound used as the host suppressed the quenching, and the aromatic hydrocarbon used as the guest is highly deuterated to minimize nonradiative deactivation of the guest. Red-green-blue persistent RTP with a lifetime >1 s and a quantum yield >10% in air is realized for a pure organic material.

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