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- W1963792021 abstract "We present femtosecond pump-probe measurements, both conventional and electric field-assisted, on organic light-emitting devices based on para-hexaphenyl. The dominant triplet exciton generation mechanism is assigned to nongeminate bimolecular recombination of photogenerated, spin-$frac{1}{2}$ polarons. This process is active within a few hundred femtoseconds after photoexcitation and involves about 20% of the initially excited states. At higher photoexcitation densities, we observe an additional triplet generation mechanism, which occurs in the 10-ps time domain, due to fusion of singlet excitons and subsequent fission into correlated triplet pairs. The latter decay on the ${10}^{2}ensuremath{-}mathrm{ps}$ time scale by geminate recombination." @default.
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- W1963792021 date "1999-06-01" @default.
- W1963792021 modified "2023-10-15" @default.
- W1963792021 title "Ultrafast photogeneration mechanisms of triplet states in<i>para</i>-hexaphenyl" @default.
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- W1963792021 doi "https://doi.org/10.1103/physrevb.59.14336" @default.
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