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- W2000381108 abstract "We analyze the generation and recombination of charged states in oligo(phenylenevinylene)s at high photoexcitation densities, using femtosecond pump-probe spectroscopy as a direct probe for the time-dependent density of photogenerated singlet, triplet, and doublet states. Pairs of charged states are formed during the exciting laser pulse, partly by a two-photon process. Geminate recombination of these pairs is found in the first ps after formation, after which a nongeminate dispersive mechanism prevails. The application of high electric field strengths opens up an additional channel for charge carrier formation, involving field-induced electron transfer between two singlet excitons. This process is competing with bimolecular singlet exciton annihilation. Field-induced formation of triplet states is governed by nongeminate recombination of field-induced charged states. We give values for cross sections of the photogenerated species, the efficiency of field-induced charge carrier photogeneration and for the early charge carrier mobility." @default.
- W2000381108 created "2016-06-24" @default.
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- W2000381108 date "2003-10-15" @default.
- W2000381108 modified "2023-10-12" @default.
- W2000381108 title "Charge carrier photogeneration in oligo(phenylenevinylene) thin films: A quantitative study" @default.
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- W2000381108 doi "https://doi.org/10.1103/physrevb.68.155313" @default.
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