Picosecond Ultrafast Kinetic Study of Dyes Sensitized Silver Bromine Microcrystals

doi:10.7517/j.issn.1674-0475.2005.06.428

Abstract

Abstract: On the basis of Streak Camera technique,fluorescence spectroscopy of three kinds of dyes J-aggregate adsorbed on cubic AgBr microcrystals was detected in time resolve 5 ps.The dependence of ultrafast electron transfer from dye J-aggregate to conduction band of AgBr on different dyes with different concentration was analyzed.And the micro mechanism of sensitization was also analyzed.It is showed that the dynamic decay curves can be fitted well by a double-exponential function.The fitting curves are consisted of a fast component and a slow one.Because of the large amplitude of the fast component,the fast decay should be mainly attributable to the electron transfer from J-aggregate of dye to conduction band of AgBr.The photo-induced electron transfer rate and the sensitization efficiency show certain change tendency with the change of dye concentration.As the dye concentration increasing,the sensitization efficiency decreases.

Key words: spectral sensitization, electron transfer rate, Streak Camera, silver bromide

CLC Number:

YANG Shao-peng, FAN Guo-zhi, Cao Ning, LI Xiao-wei, HAN Li, FU Guang-sheng. Picosecond Ultrafast Kinetic Study of Dyes Sensitized Silver Bromine Microcrystals[J]. Imaging Science and Photochemistry, 2005, 23(6): 428-434.

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