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The oxygen-free x-ray storage phosphor BaFBr, doped with Sr2+ and having Br− vacancies due to fluorine excess, is shown to have a high photostimulability shifted appreciably to lower photon energy compared to nondoped BaFBr because of the predominant generation of FA(Sr2+) centers on the Br− sublattice upon room-temperature x irradiation. The FA(Br−,Sr2+) centers are less stable than unperturbed F(Br−) centers. Therefore, the redshift of the photostimulability disappears upon thermal activation above room temperature. From the failure to observe an F center infrared emission, it is concluded that F and FA centers are spatially correlated to hole centers of yet unknown nature.
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Dietze et al. (1996) studied this question.
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