Abstract
Luminescence and excitation experiments in AgBr and AgCl are described and interpreted for weakly bound excitons associated with divalent metal and chalcogen impurities like Cd 2+, S 2- etc. In the analysis, data on corresponding donors are used and central cell effects considered. The results are essentially in agreement with the assumption of recombination of (D 0, X) complexes. Additional results are presented for crystals containing higher impurity concentrations or thermally treated. Experiments on excitons weakly bound at randomly fluctuating potentials due to compositional disorder in AgBr 1− x Cl x alloys are also reported. Temperature variation, time-resolved resonant light scattering and hydrostatic pressure are employed to study emission specific to the alloy. the results proving that it is due to this type of localized exciton state.
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