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- W3015298768 abstract "Description of excitation energy transfer (EET) in large multichromophoric systems of nanoscale size is often inconsistent with the classical Forster model. In this work, abnormal enhancement of emission in a heterogeneous mixture of J-aggregates of donor and acceptor thiamonomethinecyanine dyes is reported, which surpasses the sum of emissions of the neat donor and acceptor J-aggregate solutions. Despite the tight overlap of the photoluminescence emission band of the donor J-aggregate and the absorption band of the acceptor J-aggregate, a direct dipole–dipole resonant energy transfer was found to have only a marginal contribution to the overall enhancement, with efficiency less than 10%, whereas the major contribution came from the non-Forster mechanism, which was interpreted as exciplex formation in the heterogeneous system. The enhanced emission was preceded by the exciton migration within the J-aggregate to specific sites, where a competition between formation of exciplex and excimer took place due to interaction with the foreign or own dimers in the ground state, respectively, due to which the excitation lifetime exceeded that of a free exciton in the neat J-aggregate." @default.
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- W3015298768 date "2019-01-01" @default.
- W3015298768 modified "2023-09-26" @default.
- W3015298768 title "Abnormal Emission in the Heterogeneous J-Aggregate System" @default.
- W3015298768 hasPublicationYear "2019" @default.
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