Distribution of Blue and Green Luminescence Centers in Barrier Regions of the Grains of Zinc Sulfide Electroluminophors |
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Authors: | S. M. Kokin S. N. Mikov I. P. Puzov |
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Affiliation: | (1) Moscow State University of Railways, 15 Obraztsov Str., Moscow, 103055, Russia;(2) Ul'yanovsk State University, Ul'yanovsk, Russia |
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Abstract: | Based on the investigation of the spectra of two-photon excited luminescence of powder zinc sulfide electroluminophors, their electroluminescence spectra measured under different conditions at different stages of degradation, and also the data known from the literature dealing with the study of the microstructure of ZnS:Cu crystals, a conclusion has been drawn that the centers of green and blue luminescence are nonuniformly distributed over the luminophor grains. It is presumed that close by the surface of the grains, near the second phase–zinc–sulfide interface (the regions of energy barriers responsible for impact multiplication of charge carriers in prebreakdown electroluminescence) the centers of green luminescence predominate, while the blue luminescence centers are located at the periphery of the barriers, in deeper regions of the crystals. |
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Keywords: | zinc sulfide luminophor energy barrier luminescence center two-photon excited luminescence |
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