Study of Blue Photoluminescent Band in ZnS Crystals
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The zinc sulphide crystals as-grown and heat treated in different atmospheres, have been studied by photoluminescence technique. A blue emission band (IB) peaking at 2.91 eV has been identified in the mentioned crystals. Parameters of the IB band such as peak energy, half width of spectrum, lifetime of photoluminescence as well as a superlinearly excitation intensity dependence of the luminescence have been determined. A model of the IB transition is proposed to explain the properties and features of IB luminescence.
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