Studies on Some Infrared Stimulable Phosphors

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Abstract
Physical properties of the two phosphor systems SrS: Ce,Sm, and SrS: Eu,Sm, as well as the base material SrS, have been studied. The optical studies concern spectra of transmission, excitation, fluorescence, phosphorescence, stimulation, and stimulated emission. Relative storage efficiencies of the major exciting wavelengths have been measured. Time characteristics of the phosphorescence and the infrared exhaustion have been determined. The dc photoconductive response as a function of the wavelength of the incident light has been studied. A simplified band-theory model which correlates all of the experimental data in conjunction with the electronic structures of the activators is presented.