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Efficient Light Emitters in the Solid State: Synthesis, Aggregation-Induced Emission, Electroluminescence, and Sensory Properties of Luminogens with Benzene Cores and Multiple Triarylvinyl Peripherals

Authors

  • Carrie Y. K. Chan,

    1. Department of Chemistry, The Hong Kong University of Science & Technology (HKUST), Clear Water Bay, Kowloon, Hong Kong, P. R. China, Fax: +852-2358-1594
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  • Zujin Zhao,

    1. Department of Chemistry, The Hong Kong University of Science & Technology (HKUST), Clear Water Bay, Kowloon, Hong Kong, P. R. China, Fax: +852-2358-1594
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  • Jacky W. Y. Lam,

    1. Department of Chemistry, The Hong Kong University of Science & Technology (HKUST), Clear Water Bay, Kowloon, Hong Kong, P. R. China, Fax: +852-2358-1594
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  • Jianzhao Liu,

    1. Department of Chemistry, The Hong Kong University of Science & Technology (HKUST), Clear Water Bay, Kowloon, Hong Kong, P. R. China, Fax: +852-2358-1594
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  • Shuming Chen,

    1. Center for Display Research, HKUST, Clear Water Bay, Kowloon, Hong Kong, P. R. China
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  • Ping Lu,

    1. State Key Laboratory of Supermolecular Structure and Materials, Jilin University, Changchun 150012, P. R. China
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  • Faisal Mahtab,

    1. Department of Chemistry, The Hong Kong University of Science & Technology (HKUST), Clear Water Bay, Kowloon, Hong Kong, P. R. China, Fax: +852-2358-1594
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  • Xiaojun Chen,

    1. Department of Physics, HKUST, Clear Water Bay, Kowloon, Hong Kong, P. R. China
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  • Herman H. Y. Sung,

    1. Department of Chemistry, The Hong Kong University of Science & Technology (HKUST), Clear Water Bay, Kowloon, Hong Kong, P. R. China, Fax: +852-2358-1594
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  • Hoi Sing Kwok,

    1. Center for Display Research, HKUST, Clear Water Bay, Kowloon, Hong Kong, P. R. China
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  • Yuguang Ma,

    1. State Key Laboratory of Supermolecular Structure and Materials, Jilin University, Changchun 150012, P. R. China
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  • Ian D. Williams,

    1. Department of Chemistry, The Hong Kong University of Science & Technology (HKUST), Clear Water Bay, Kowloon, Hong Kong, P. R. China, Fax: +852-2358-1594
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  • Kam Sing Wong,

    1. Department of Physics, HKUST, Clear Water Bay, Kowloon, Hong Kong, P. R. China
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  • Ben Zhong Tang

    Corresponding author
    1. Department of Chemistry, The Hong Kong University of Science & Technology (HKUST), Clear Water Bay, Kowloon, Hong Kong, P. R. China, Fax: +852-2358-1594
    2. Department of Polymer Science and Engineering, Zhejiang University, Hangzhou 310027, P. R. China
    • Department of Chemistry, The Hong Kong University of Science & Technology (HKUST), Clear Water Bay, Kowloon, Hong Kong, P. R. China, Fax: +852-2358-1594.
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Abstract

Benzene-cored luminogens with multiple triarylvinyl units are designed and synthesized. These propeller-shaped molecules are nonemissive when dissolved in good solvents, but become highly emissive when aggregated in poor solvents or in the solid state, showing the novel phenomenon of aggregation-induced emission. Restriction of intramolecular motion is identified as the main cause for this effect. Thanks to their high solid-state fluorescence quantum yields (up to unity) and high thermal and morphological stabilities, light-emitting diodes with the luminogens as emitters give sky-blue to greenish-blue light in high luminance and efficiencies of 10800 cd m−2, 5.8 cd A−1, and 2.7%, respectively. The emissions of the nanoaggregates of the luminogens can be quenched exponentially by picric acid, or selectively by Ru3+, with quenching constants up to 105 and ∼2.0 × 105 L mol−1, respectively, making them highly sensitive (and selective) chemosensors for explosives and metal ions.

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