Determination of kinetic parameters of thermally stimulated luminescence of Cu-doped BaSO 4

Abstract

Studies of thermally stimulated luminescence (TSL) of doped BaSO 4 with Cu activator have been carried out. The polycrystalline sample of Cu-doped BaSO 4 is prepared by recrystallisation method. The characterization and elemental analysis of BaSO 4:Cu compound are carried out by X-ray diffraction (XRD) and energy-dispersive X-ray spectroscopy (EDX). The compound has orthorhombic structure at room temperature. The TSL studies of Cu-doped BaSO 4 sample show two glow peaks at 160 and 227 °C. Comparison of TL intensity of the most intensive glow peak of Cu- and Mn-doped BaSO 4 compounds with that of undoped BaSO 4 shows that addition of Cu and Mn impurity in BaSO 4 compound enhances the TL intensity by about 9 and 3 times, respectively. Among the studied samples, namely undoped, Cu- and Mn-doped BaSO 4, Cu-doped BaSO 4 is found to be the most sensitive. The trap parameters namely order of kinetics ( b), activation energy ( E), frequency factor ( s) and Balarin parameter ( γ) associated with the most intensive glow peak, i.e. the 227 °C glow peak of BaSO 4:Cu phosphor were determined by using isothermal decay method and glow curve shape (Chen's) method and these parameters are in good agreement.