Kinetics study of ultrafast electron transfer from sensitized dyes to silver halide microcrystals |
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Authors: | Yang Shao-Peng Fan Guo-Zhi Fan Shan-Shan Cao Ning Li Xiao-Wei Jiang Xiao-Li Fu Guang-Sheng |
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Affiliation: | College of Physics Science and Technology, Hebei University, Baoding 071002, China |
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Abstract: | Spectral sensitization micromechanism of cyanine dyes J-aggregate adsorbedon the tabular and cubic AgBr microcrystals with different dyeconcentrationsis studied by using picosecond time-resolved fluorescence spectroscopy, andthe dependences of electron transfer and spectral efficiency sensitizationon different conditions are analysed in detail. With the steadyspectroscopy, the wavelengths of absorption and fluorescence of J-aggregateadsorbed on AgBr microcrystals are found to shift to red relative to dyemonomer. The spectrum of fluorescence has a red shift relative to theabsorption peak. With the time-resolved fluorescence spectroscopy, thefluorescence decay curves of cyanine dyes J-aggregate adsorbed on thetabular and cubic AgBr grains are found to be fitted well by adouble-exponential decay function. The fitting curves consist of a fast anda slow component. Because of the large amplitude of the fast component, thisfast decay should be attributable mainly to the electron transfer fromJ-aggregate of dye to a conduction band of AgBr. |
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Keywords: | spectral sensitization electron transfer fluorescencelifetime silver bromide |
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