Abstract
Photoluminescence and diffuse reflectance spectral studies reveal that the commercially available X-ray image intensifying phosphor BaFBr:Eu contains both Eu 2+ and Eu 3+ in contrast to the X-ray image storage phosphor BaFBr:Eu which contains only Eu 2+. In the former, photostimulated luminscence (PSL) at room temperature (RT) and thermostimulated luminescence (TSL) above RT are quenched. The latter, however, exhibits intense PSL and TSL. The results are explained on the basis that the presence of Eu 3+ removes the anion vacancies created by the incorporation of ubiquitous oxygen impurity at fluorine ion sites.
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