Immensely Enhanced Color-Adjustable Up-conversion Fluorescence in Electron Donor-Acceptor Exciplex Chromophores Doped with Fluorescent Emitters

Posted on 30.04.2021 - 15:33
Two-photon excited fluorescence (TPEF) materials usually suffer from inefficient two-photon absorption (TPA) and non-radiative excited states. Here, up-conversion fluorescence in electron donor-acceptor (D-A) exciplex doped with fluorescent emitters are systemitically investigated. It has been found that the un-doped D-A exciplex exhibits enhancements of ~129% and ~365% in up-conversion fluorescence compared with donor- and acceptor-only systems, respectively. Interestingly, photoluminescence quantum yields (PLQY) upto ~98.65% were measured and immensely enhanced up-conversion fluorescence was observed after doping various fluorescent emitters into D-A exciplex. Our results reveal the existence of two-photon excited energy harvesting in thermally activated delayed fluorescence (TADF) D-A exciplex doped with fluorescent emitters, via reverse intersystem crossing (RISC) followed by rapid Förster resonance energy transfer (FRET). Moreover, additional gain mechanism related to intermolecular CT interaction occurs at TPA stage is found in TADF D-A exciplex system.

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Chen, Zhen; Zhou, Qian; Du, Huitian; Yu, Yuan; Zhang, Chuang; Han, Shenghao; et al. (2021): Immensely Enhanced Color-Adjustable Up-conversion Fluorescence in Electron Donor-Acceptor Exciplex Chromophores Doped with Fluorescent Emitters. The Optical Society. Collection. https://doi.org/10.6084/m9.figshare.c.5178254.v1
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