Thermoluminescence study of UV irradiated Ce doped SrS nanostructures

Thermoluminescence (TC) study and kinetic analysis of UV irradiated Ce doped SrS nanostructures have been presented. Cerium concentration has been tuned to the maximum TL intensity. Cerium (0.5 mol%) doped SrS nanocrystalline phosphor exhibits a broad TL glow curve around 371 K at a heating rate of 10 K/s. We noted that TL intensity increases with UV exposure time in the range 2 min-4 h and saturates between 4 h and 8 h of exposure which may be explained on the basis of track interaction model (TIM) and a high surface to volume ratio for the nanostructures. Further increase in the dose results into a decrease of TL intensity. The effect of different heating rates on the TL glow curve has also been investigated. The trapping parameters namely activation energy (E), order of kinetics (b) and frequency factor (s) for SrS:Ce (0.5 mol%) have been deter-mined using glow curve deconvolution (GCD) functions. (C) 2009 Elsevier B.V. All rights reserved.