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Single crystals of CsI, CsI:Tl, and CsI:Tl,Bi were grown by the vertical Bridgman method. We studied the effect of Bi 3+ codoping on the CsI:Tl X-ray-induced afterglow. Thermally stimulated luminescence measurements were carried out in order to investigate the role of traps. The results showed a remarkable reduction of afterglow, of about an order of magnitude, and of trap concentration by Bi codoping. These improvements could be related to a possible role of Bi in the compensation of intrinsic nonstoichiometry defects.
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Totsuka et al. (2012) studied this question.
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