STUDIES ON TL AND DECAY OF BAS-CU PHOSPHORS

Thermoluminescence (TL) and phosphorescence of BaS:Cu phosphors have been studied in this investigation of exciting at 28°C by low energy electrons, X-rays and UV light. While by UV light only one TL glow peak around 80°C can be observed, by X-ray and electron irradiation additional glow peaks at 187°C, 287°C and 427°C have been produced. The TL output diminishes with the time of storage in darkness. Considering the color of fluorescence, TL emission and the nature of decay (afterglow and TL), the traps involved in this system may be associated with Cu centers located either near S-- ion vacancy or with halogen ions in their neighborhood. © 1978.