The influence of calcium co-doping on the optical properties of the x-ray storage phosphor BaFBr : Eu 2+ is determined by photo-stimulated luminescence techniques. It is found that the incorporation of calcium into the lattice results in a broadening of the photo-stimulation peak due to a calcium induced F A (Br − , Ca 2+ )-centre with stimulation maxima at 540 and 680 nm. The optical cross-sections for the photo-stimulated process are determined by utilizing stimulation light with linearly increasing intensity. Furthermore, it is shown that the sensitivity for x-rays, i.e. the number of storage centres formed during x-ray exposure, increases up to a doping level of 1 mol% while it drops rapidly at higher calcium concentrations.
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Schlapp et al. (2002) studied this question.
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