Study of the Photoelectron Lifetimes of Ce³⁺-Doping Silver Halide Emulsion Microcrystals with a Microwave Photoconductivity Technique

The five silver iodobromide emulsions with various concentrations, of trivalent cerium ions including a Ce³⁺-free one, have been made by use of singlejet method. The Photoconductivity and the decay process of photoconductivity were examined with a microwave photoconductivity technique, and then the photoelectron lifetimes were determined. The experimental results showed that with increasing the Ce³⁺ doping concentration from 0 (i.e. Ce³⁺-free emulsion) to 3.76×10^-2 mol Ce³⁺/mol AgBr the photoelectron lifetime of the emulsion microcrystals reduced by half. It was inferred that Ce³⁺ paid the role of the photoelectron traps in the silver iodobromide emulsion microcrystals.