Abstract
An infrared fluorescence was observed for ZnS : Cu, Al and ZnS : Cu, Ga at 1.57μ and 1.72μ. This emission appeared to be excited at low temperatures by radiation of 1.38μ and between 0.5μ and 0.8μ, provided that the phosphor was excited by 3650 Å. The infrared quenching of the visible fluorescence and an infrared stimulation of the visible phosphorescence show a spectrum analogous to the infrared excitation spectrum, and seem to be connected with the same transitions.
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