Cathodoluminescence Saturation and Decay Characteristics of ZnS: Cu,Al Phosphor

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Abstract
An attempt at a qualitative understanding of the luminescence saturation mechanisms of ZnS: Cu, Al phosphor has been made by studying the exicitation current-density dependences of the luminescence efficiencies and decays at several activator concentrations, temperatures and accelerating voltages. The saturation behavior is independent of the Cu and Al concentrations in the region >10-4 g·atom/mol-ZnS. Neither the temperature nor the accelerating voltage affects the saturation. Nonradiative deactivation of the luminescent centers occurs in the early stages of the decay. Auger recombination involving a donor-acceptor pair is postulated as the nonradiative process responsible for the saturation.