Photoelectron characteristic of silver chloride microcrystals adsorbing dye excited by laser

摘要

The characteristic of semi-conduct will be influenced, when environmental conditions act on it. Silver halide microcrystals, kind of false compositive microcrystals, is a kind of typical photoelectric material. In this work, the silver chloride microcrystals adsorbing dye are excited by laser with different wavelengths, the photoelectron signals of which are measured by microwave adsorption dielectric spectrum equipment with a high time resolution (Ins). It is found that the photoelectron decay time of pure emulsion excited by 355nm and 532nm laser is respective 109ns and 47ns; The photoelectron decay time of sensitized emulsion with sensitization concentration of 4mg/40g is respective 83ns and 23ns when it is excited by 355nm and 532nm laser; The photoelectron decay time of sensitized emulsion with sensitization concentration of 8mg/40g is respective 76ns and 12ns when it is excited by 355nm and 532nm laser. The results show that the change extent of photoelectron decay are not the same when silver chloride emulsion is excited by laser with different wavelengths, so the sensitive effect of adsorbed dye is different under different exposal wavelengths.