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• W2044143359 abstract "We study ultrafast relaxation processes of odd- ${(B}_{u})$ and even-parity ${(A}_{g})$ exciton states in poly(p-phenylene vinylene) derivatives. The ${B}_{u}$ states are studied using a regular two-beam pump-and-probe spectroscopy, which can monitor vibronic relaxation and exciton diffusion. In order to observe the ${A}_{g}$ states, a three-beam femtosecond transient spectroscopy is developed, in which two different excitation pulses successively generate odd-parity ${(1B}_{u})$ excitons at 2.2 eV and then reexcite them to higher ${A}_{g}$ states. We are able to distinguish two different classes of ${A}_{g}$ states: one class ${(mA}_{g})$ experiences ultrafast internal conversion back to the lowest singlet exciton, whereas the other class ${(kA}_{g})$ in violation of the Vavilov-Kasha's rule undergoes a different relaxation pathway. The excitons subsequently dissociate into long-lived polaron pairs, which results in emission quenching with the action spectrum similar to that of the intrinsic photoconductivity. We conclude that the ${A}_{g}$ states above 3.3 eV ${(kA}_{g})$ are charge-transfer states, that mediate carrier photogeneration." @default.
• W2044143359 created "2016-06-24" @default.
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• W2044143359 date "2002-05-20" @default.
• W2044143359 modified "2023-10-06" @default.
• W2044143359 title "Excited-state relaxation in π-conjugated polymers" @default.
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• W2044143359 doi "https://doi.org/10.1103/physrevb.65.205209" @default.
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