Abstract
C12A7:0.5%Tb3+, x%Sr2+ X-ray phosphors with various concentrations were prepared by a combustion method. For the phosphor with the optimal concentration (x=5), the strongest green photostimulated luminescence (PSL), originating from the 5D4-7F5 transition of Tb3+ ion, can be achieved. It was found that its X-ray absorption capacity was increased and its X-ray dynamic range was extended after Sr doping. For this phosphor, the conversion efficiency (CE) (∼1.42 pJ/mm2/mR) is higher than that of C12A7:0.5%Tb3+ phosphor (∼1.28 pJ/mm2/mR) because of the substitution of Ca by Sr with higher atomic number. Meanwhile, for the Sr doped C12A7:0.5%Tb3+ X-ray phosphors, the change in the local environment near the electrons captured by the enlarged empty cages will lead to the variation in the trap distribution. High-quality X-ray imaging (15 lp/mm) of the X-ray phosphor suggests that it is a potential candidate material for computed radiography system or erasable/rewritable optical memory media.
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