Abstract
Abstract The nature of trapping and emission centres in various impurity doped BaSO4 phosphors has been investigated by thermoluminescence (glow curves and emission spectra) and esr techniques. The results indicate that anion radicals (such as SO4 −, SO3 −, O3 − etc) that act as trapped hole centres are formed by γ-irradiation. It has been found that corresponding to the temperatures at which the above centres are annihilated there are glow peaks in the TL curves. It is, therefore, suggested that the thermally released holes from each of such centres are mobile and recombine at some trapped electron centres. The energy thus released excite the impurity ion present, which on returning to the normal state gives its characteristic emission.
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