Physico-chemistry of the surface of zinc sulfide phosphor activated by copper

The physic-chemical properties of ZnS:Cu, Cl, Br radioluminophor, with copper content of 0; 0,01; 0,1 and 0,6 wt, % were studied. This radioluminophor was synthesized in СПбГТИ (ТУ) by calcination of load in crucible under the layer of activated carbon. Load processing was subjected to electron beam modification. The resulting phosphors were subjected to low-temperature annealing at temperature of 650 °C. It was shown, that the studied samples are polydisperse powders. The sizes and shapes of crystals of phosphor powders change with a change in copper concentration. The size The acid-base surface state of the phosphor samples, determined by pH-metry and the indicator method, is affected by both the content of activator and the samples dispersity. The formation of ZnO or CuO oxide compounds on the surface of phosphor particles during annealing, the precipitation of additional CuxS phase in defects and on the particles surface, and the different content of wurtzite and sphalerite phases are important factors that influence on acid-base state of phosphor surface. In the photoluminescence spectra of the samples, two bands are observed in the green and blue regions of the spectrum, the intensity of which varies with the copper content. Contribution of the authors: the authors contributed equally to this article. The authors declare no conflicts of interests.

Keywords

Authors

References