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Reversible Switching of the Emission of Diphenyldibenzofulvenes by Thermal and Mechanical Stimuli

Authors

  • Xiaoliang Luo,

    1. Department of Chemistry, Beijing Normal University, Beijing, 100875, P. R. China
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  • Jienian Li,

    1. Department of Chemistry, Beijing Normal University, Beijing, 100875, P. R. China
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  • Cuihong Li,

    1. Department of Chemistry, Beijing Normal University, Beijing, 100875, P. R. China
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  • Liping Heng,

    1. Department of Chemistry, Institute of Molecular Functional Materials, The Hong Kong University of Science & Technology (HKUST), Clear Water Bay, Kowloon, Hong Kong, P. R. China
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  • Yong Qiang Dong,

    Corresponding author
    1. Department of Chemistry, Beijing Normal University, Beijing, 100875, P. R. China
    • Department of Chemistry, Beijing Normal University, Beijing, 100875, P. R. China
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  • Zhengping Liu,

    1. Department of Chemistry, Beijing Normal University, Beijing, 100875, P. R. China
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  • Zhishan Bo,

    1. Department of Chemistry, Beijing Normal University, Beijing, 100875, P. R. China
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  • Ben Zhong Tang

    Corresponding author
    1. Department of Chemistry, Institute of Molecular Functional Materials, The Hong Kong University of Science & Technology (HKUST), Clear Water Bay, Kowloon, Hong Kong, P. R. China
    2. Fok Ying Tung Research Institute, Nansha, Guangzhou, P. R. China
    3. Department of Polymer Science and Engineering, Zhejiang University, Hangzhou 310027, P. R. China
    • Department of Chemistry, Institute of Molecular Functional Materials, The Hong Kong University of Science & Technology (HKUST), Clear Water Bay, Kowloon, Hong Kong, P. R. China.
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Abstract

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The thermochromic and mechanochromic fluorescence of diphenyldibenzofulvenes is investigated. Emission is boosted and blue-shifted upon crystallization. Yellow emissive crystals of the material transform to green fluorescent crystals upon heating before melting. Reversible switching of the emission color and efficiency are achieved by repeated amorphization and crystallization of dye molecules by a pure thermal process or grinding–heating cycles.

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