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- W3129585024 endingPage "109249" @default.
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- W3129585024 abstract "Exciplex-based thermally activated delayed fluorescence (TADF) materials show long luminescence lifetimes and high quantum efficiency by converting the non-radiative triplets into the radiative singlets. Here, strong upconverted fluorescence from the amorphous thin films of TADF donor-acceptor (D-A) exciplexes is observed under near-infrared excitation. The spectroscopic studies demonstrate that the enhanced upconversion in exciplex emission combines a series of excited state processes including the two-photon absorption (TPA) of donors and the TADF of D-A pairs. The comparison between donor-only and D-A systems indicates that the upconversion is greatly facilitated by the energy harvesting mechanisms existing in the exciplex-based TADF materials. The results reveal the formation mechanism of exciplex excited-states following the two-photon excitation in D-A blends, and consequently the potentials of exciplex materials in nonlinear optics applications. Moreover, a maximum D-A distance of ~6.9 nm for two-photon excited exciplex formation is obtained." @default.
- W3129585024 created "2021-03-01" @default.
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- W3129585024 date "2021-04-01" @default.
- W3129585024 modified "2023-09-26" @default.
- W3129585024 title "Enhanced two-photon-excited fluorescence from electron donor-acceptor exciplex" @default.
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- W3129585024 doi "https://doi.org/10.1016/j.dyepig.2021.109249" @default.
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