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Chin. Phys., 2006, Vol. 15(5): 1055-1059    DOI: 10.1088/1009-1963/15/5/031
CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES Prev   Next  

Kinetics study of ultrafast electron transfer from sensitized dyes to silver halide microcrystals

Yang Shao-Peng, Fan Guo-Zhi, Fan Shan-Shan, Cao Ning, Li Xiao-Wei, Jiang Xiao-Li, Fu Guang-Sheng
College of Physics Science and Technology, Hebei University, Baoding 071002, China
Abstract  Spectral sensitization micromechanism of cyanine dyes J-aggregate adsorbed on the tabular and cubic AgBr microcrystals with different dye concentrations is studied by using picosecond time-resolved fluorescence spectroscopy, and the dependences of electron transfer and spectral efficiency sensitization on different conditions are analysed in detail. With the steady spectroscopy, the wavelengths of absorption and fluorescence of J-aggregate adsorbed on AgBr microcrystals are found to shift to red relative to dye monomer. The spectrum of fluorescence has a red shift relative to the absorption peak. With the time-resolved fluorescence spectroscopy, the fluorescence decay curves of cyanine dyes J-aggregate adsorbed on the tabular and cubic AgBr grains are found to be fitted well by a double-exponential decay function. The fitting curves consist of a fast and a slow component. Because of the large amplitude of the fast component, this fast decay should be attributable mainly to the electron transfer from J-aggregate of dye to a conduction band of AgBr.
Keywords:  silver bromide      electron transfer      fluorescence lifetime      spectral sensitization  
Received:  11 July 2005      Revised:  23 February 2006      Published:  20 May 2006
PACS:  78.47.-p (Spectroscopy of solid state dynamics)  
  61.66.Fn (Inorganic compounds)  
  61.66.Hq (Organic compounds)  
  61.72.S- (Impurities in crystals)  
  68.43.Mn (Adsorption kinetics ?)  
  78.40.Me (Organic compounds and polymers)  
Fund: Project supported by the National Natural Science Foundation of China (Grant Nos 60478033, 10274017 and 10354001), the Natural Science Foundation of Hebei Province of China (Grant No 603138), Science and Technology Program of Hebei Province of China (Gran

Cite this article: 

Yang Shao-Peng, Fan Guo-Zhi, Fan Shan-Shan, Cao Ning, Li Xiao-Wei, Jiang Xiao-Li, Fu Guang-Sheng Kinetics study of ultrafast electron transfer from sensitized dyes to silver halide microcrystals 2006 Chin. Phys. 15 1055

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