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Influence of energy gap between charge-transfer and locally excited states on organic long persistence luminescence

Author

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  • Zesen Lin

    (Kyushu University
    Okinawa Institute of Science and Technology Graduate University
    Kyushu University)

  • Ryota Kabe

    (Kyushu University
    Okinawa Institute of Science and Technology Graduate University
    Kyushu University)

  • Kai Wang

    (Kyushu University
    Soochow University)

  • Chihaya Adachi

    (Kyushu University
    Kyushu University
    Kyushu University)

Abstract

Organic long-persistent luminescence (LPL) is an organic luminescence system that slowly releases stored exciton energy as light. Organic LPL materials have several advantages over inorganic LPL materials in terms of functionality, flexibility, transparency, and solution-processability. However, the molecular selection strategies for the organic LPL system still remain unclear. Here we report that the energy gap between the lowest localized triplet excited state and the lowest singlet charge-transfer excited state in the exciplex system significantly controls the LPL performance. Changes in the LPL duration and spectra properties are systematically investigated for three donor materials having a different energy gap. When the energy level of the lowest localized triplet excited state is much lower than that of the charge-transfer excited state, the system exhibits a short LPL duration and clear two distinct emission features originating from exciplex fluorescence and donor phosphorescence.

Suggested Citation

  • Zesen Lin & Ryota Kabe & Kai Wang & Chihaya Adachi, 2020. "Influence of energy gap between charge-transfer and locally excited states on organic long persistence luminescence," Nature Communications, Nature, vol. 11(1), pages 1-7, December.
    • Handle: RePEc:nat:natcom:v:11:y:2020:i:1:d:10.1038_s41467-019-14035-y
    DOI: 10.1038/s41467-019-14035-y
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    Cited by:

    1. Waygen Thor & Yue Wu & Lei Wang & Yonghong Zhang & Peter A. Tanner & Ka-Leung Wong, 2021. "Charging and ultralong phosphorescence of lanthanide facilitated organic complex," Nature Communications, Nature, vol. 12(1), pages 1-9, December.
    2. Rongjuan Huang & Yunfei He & Juan Wang & Jindou Zou & Hailan Wang & Haodong Sun & Yuxin Xiao & Dexin Zheng & Jiani Ma & Tao Yu & Wei Huang, 2024. "Tunable afterglow for mechanical self-monitoring 3D printing structures," Nature Communications, Nature, vol. 15(1), pages 1-11, December.

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