Determination of kinetic parameters of thermally stimulated luminescence of Cu-doped BaSO4

摘要

Studies of thermally stimulated luminescence (TSL) of doped BaSO4 with Cu activator have been carried out. The polycrystalline sample of Cu-doped BaSO4 is prepared by recrystallisation method. The characterization and elemental analysis of BaSO4: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 BaSO4 sample show two glow peaks at 160 and 227 1C. Comparison of TL intensity of the most intensive glow peak of Cu- and Mn-doped BaSO4 compounds with that of undoped BaSO4 shows that addition of Cu and Mn impurity in BaSO4 compound enhances the TL intensity by about 9 and 3 times, respectively. Among the studied samples, namely undoped, Cu- and Mn-doped BaSO4, Cu-doped BaSO4 is found to be the most sensitive. The trap parameters namely order of kinetics (b), activation energy (E), frequency factor (s) and Balarin parameter (g) associated with the most intensive glow peak, i.e. the 227 1C glow peak of BaSO4:Cu phosphor were determined by using isothermal decay method and glow curve shape (Chen’s) method and these parameters are in good agreement.