Thermoluminescence due to intrinsic point defects in polycrystalline calcium sulphide

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Abstract
A predominant glow peak at 226+or-3K in calcium sulphide, reported here, is thought to be due to sulphur vacancies acting as electron traps. In all, there are four predominant glow peaks in pure and cerium-activated CaS, two of which have been previously reported by the authors. These exhibit a significant behaviour which has been analysed to reveal the presence of hole traps as well as deep electron traps due to intrinsic point defects in CaS. Cerium has been used primarily to enhance thermoluminescence emission of CaS. However, in view of the fact that the role of cerium in producing compensating defects in CaS is still highly controversial, its role in the present work has been examined.