On the photo-stimulated luminescence of BaFBr:Eu+2 phosphors

The distinctive features of photo-stimulated luminescence (PSL) of the X-ray storage phosphor BaFBr:Eu+2 are interpreted on the ground of a monomolecular electron–hole recombination mechanism. The thermal enhancement of PSL intensity is explained by taking into account a three level scheme for F(Br−) centres. A comparison with data on PSL intensity versus temperature reported in literature is presented.