Transients in the Blue and Green Luminescence of ZnS:Cu:Cl Crystals

Abstract
Upon exciting the investigated ZnS crystals by the light of two wavelengths, 0.37 and 0.33 μ, in succession, their blue luminescence at low temperatures was found to rise to a maximum Im from which it decayed to its normal steady value I. The green luminescence band showed a similar effect above 170°K. A reduction in the degree of filling of the ``blue'' traps was found to take place during the decay of the transients at low temperatures. Results are discussed using a previously proposed energy model.