High Resolution Cathodoluminescence of Yellow and Waterclear CVD Polycrystalline ZnS.
AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH SCHOOL OF ENGINEERING
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This investigation used high resolution cathodoluminescence to determine the spectral emissions and optical properties of the yellow and waterclear forms of undoped cubic chemical-vapor-deposited polycrystals of ZnS. The spectra between 3200 and 9000 A was investigated at 10 K. The yellow material was determined to have characteristically poor quality with little band edge structure. The special annealing procedure used to make waterclear ZnS from the yellow ZnS was found to greatly improve the quality of the crystals. Waterclear ZnS was of a quality equivalent to the best single crystals despite the polycrystalline form. It had a complex near band edge structure. Oxygen was found to have migrated to the crystal boundaries. The spectra of the waterclear ZnS at 10 K agreed with the literature.