Thermally stimulated and photo-stimulated conductivity in ZnS-Cu single crystals

The development of thermally stimulated and photo-stimulated conductivity in zinc-sulfide phosphors has been studied. The sign of the charge carriers in the single crystal samples inspected has been determined. The effect of infrared light in the region 1–3.5 m upon previously excited crystals has been investigated and the temperature dependence of the photostimulated conductivity established.In conclusion, the authors express their deep gratitude to E. S. Bespalovaya for the samples and also to K. Arun for his help in measuring the Hall constant.