Abstract: In this paper, the fluorescence decay property of J-aggregates of anionic-cationic cyanine dye, anion dye and cation dye adsorbed on cubic and tabular AgBrI grains is investigated using femtosecond fluorescence up-conversion technology. The kinetics of the ultrafast electron transfer and the spectral sensitization property in the dye sensitized system are analyzed in details. By comparing the fluorescence decay property of the sensitization system of several dyes, it is found the electron transfer velocities of J-aggregates of anionic-cationic dyes is larger than that of anion dye, cation dye and the mixed of anion dye and cation dye. The sensitized efficiency of anionic-cationic dyes for the tabular grains is higher than that for the cubic ones. Dye2 has higher sensitized efficiency than Dye1 for both kinds of AgBrI grains.

Key words: femtosecond fluorescence up-conversion, anion-cation cyanine dyes, AgBrI, electron transfer, spectral sensitization