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ENERGY BAND MODEL FOR INFRARED STIMULATED EMISSION IN ZINC SULFIDE SINGLE CRYSTALS.
AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH SCHOOL OF ENGINEERING
Broad-band blue photoluminescence and phosphorescence of Group IA doped zinc sulfide bulk single crystals is examined at 77 degrees K. Photoconductivity and photovoltage effects are measured at 4.2 degrees K and thermoluminescence and thermally stimulated currents are measured from 4.2 degrees K to room temperature. The infrared stimulated visible emission from an excited crystal at 77 degrees K is measured as a function of ir wavelength between 1.8 and 2.6 microns. The observed absence of photoconductivity and thermally stimulated currents and the photoluminescence and ir and thermally stimulated emissions are explained by distant pair recombinations. An energy model based on this mechanism is presented. Author