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Slow recombination of spontaneously dissociated organic fluorophore excitons

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  • Takahiko Yamanaka

    (Central Research Laboratory, Hamamatsu Photonics K.K., 5000 Hirakuchi, Hamakita-ku, Hamamatsu
    Kyushu University)

  • Hajime Nakanotani

    (Kyushu University
    Kyushu University)

  • Chihaya Adachi

    (Kyushu University
    Kyushu University)

Abstract

The harvesting of excitons as luminescence by organic fluorophores forms the basis of light-emitting applications. Although high photoluminescence quantum yield is essential for efficient light emission, concentration-dependent quenching of the emissive exciton is generally observed. Here we demonstrate generation and accumulation of concentration-dependent “long-lived” (i.e., over 1 h) photo-generated carriers and the successive release of their energy as electroluminescence in a solid-state film containing a polar fluorophore. While fluorophore excitons are generally believed to be stable because of their high exciton binding energies, our observations show that some of the excitons undergo spontaneous exciton dissociation in a solid-state film by spontaneous orientation polarization even without an external electric field. These results lead to the reconsideration of the meaning of “luminescence quantum yield” for the solid films containing polar organic molecules because it can differ for optical and electrical excitation.

Suggested Citation

  • Takahiko Yamanaka & Hajime Nakanotani & Chihaya Adachi, 2019. "Slow recombination of spontaneously dissociated organic fluorophore excitons," Nature Communications, Nature, vol. 10(1), pages 1-6, December.
    • Handle: RePEc:nat:natcom:v:10:y:2019:i:1:d:10.1038_s41467-019-13736-8
    DOI: 10.1038/s41467-019-13736-8
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    Cited by:

    1. Alexander J. Gillett & Claire Tonnelé & Giacomo Londi & Gaetano Ricci & Manon Catherin & Darcy M. L. Unson & David Casanova & Frédéric Castet & Yoann Olivier & Weimin M. Chen & Elena Zaborova & Emrys , 2021. "Spontaneous exciton dissociation enables spin state interconversion in delayed fluorescence organic semiconductors," Nature Communications, Nature, vol. 12(1), pages 1-10, December.
    2. Masaki Tanaka & Chin-Yiu Chan & Hajime Nakanotani & Chihaya Adachi, 2024. "Simultaneous control of carrier transport and film polarization of emission layers aimed at high-performance OLEDs," Nature Communications, Nature, vol. 15(1), pages 1-9, December.

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