Abstract
Electron spin resonance (ESR), thermoluminescence and photoluminescence studies in Eu 2+ activated Sr 5(PO 4) 3Cl phosphor are reported in this paper. The Sr 5(PO 4) 3Cl:Eu 2+ phosphor is twice as sensitive as the conventional CaSO 4:Dy phosphor used in thermoluminescence dosimetry of ionizing radiations. It has a linear response, simple glow curve, emission peaking at 456 nm. The defect centers formed in the Sr 5(PO 4) 3Cl:Eu 2+phosphor are studied by using the technique of ESR. A dominant TL glow peak at 430 K with a smaller shoulder at 410 K is observed in the phosphor. ESR studies indicate the presence at three centers at room temperature. Step annealing measurements show a connection between one of the centers and the dominant glow peak at 430 K. The 430 K TL peak is well correlated with center I, which is tentatively identified as (PO 4) 2− radical.
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