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• W2012594760 endingPage "5123" @default.
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• W2012594760 abstract "Photoinduced electron transfer dynamics of poly(N-vinylcarbazole) (PVCz) films doped with a small amount of C60 was investigated by using picosecond and nanosecond laser flash photolysis techniques under various experimental conditions. From the time evolution of transient absorption spectra in the 600−1180 nm wavelength region, it was revealed for 0.7 mol % C60-doped PVCz films that the charge-separated state (PVCz+−C60-) between PVCz and C60 was produced immediately after excitation with a picosecond 532 nm laser pulse. The decay of the initial charge-separated state with a time constant of 1.2 ns comprised the following three channels: the charge-recombination process, the hole-migration reaction to the neighboring carbazolyl chromophores, and the formation of the local triplet state of C60 (3C60*). The reaction yield of the hole migration was estimated to be 30%. The present results were quite different from those reported previously for densely C60-doped PVCz films excited with a picosecond 355 nm laser pulse (J. Phys. Chem. 1995, 99, 1199). In order to elucidate factors causing the difference, the excitation intensity effect on the dynamics was examined, and it was found that an increase in the excitation laser intensity induced rapid formation of 3C60* by a nonlinear process immediately after excitation of a picosecond laser pulse. Under the condition where the excitation intensity was rather weak and the dense population of the excited state was avoided, the deactivation dynamics of the charge-separated state produced by the excitation at 355 nm was found to be almost the same as that by the 532 nm excitation. The nanosecond to microsecond dynamics of C60-doped PVCz films showed that the effective charge separation did not take place between the triplet state of C60 and PVCz. From these results, it was concluded that the hole-migration process inducing free carriers was effective in the initial charge-separated state of C60-doped PVCz films, and thus, relatively high reaction yield of this process was responsible for the enhancement of the photoconductivity in the films." @default.
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• W2012594760 date "1997-06-01" @default.
• W2012594760 modified "2023-09-27" @default.
• W2012594760 title "Photoinduced Electron Transfer Processes of C₆₀-Doped Poly(<i>N</i>-vinylcarbazole) Films As Revealed by Picosecond Laser Photolysis" @default.
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• W2012594760 doi "https://doi.org/10.1021/jp970303o" @default.
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