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    Ultrafast photogeneration mechanisms of triplet states in para-hexaphenyl

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    Downloads: 848
    Date
    1999-06
    Author
    Zenz, C.
    Cerullo, G.
    Lanzani, G.
    Graupner, W.
    Meghdadi, F.
    Leising, G.
    De Silvestri, S.
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    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 excition generation mechanism is assigned to nongeminate bimolecular recombination of photogenerated, spin-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)-ps time scale by geminate recombination.
    URI
    http://hdl.handle.net/10919/47905
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    • Scholarly Works, Physics [886]

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