Physical and luminescence properties of Ce3+ activated strontium phosphate glasses

초록

Strontium phosphate (SrO-P 2 O 5 - Al 2 O 3 - Gd 2 O 3 ) glasses with 0.05, 0.1, 0.5, and 1 mol % CeO 2 were prepared by the conventional melt quenching technique. These glasses' luminescence, scintillation, and physical properties were measured and discussed in detail. The density, refractive index, and oxygen packing density of the studied glasses were increased with an increase in CeO 2 concentration. At lower concentrations of CeO 2 , the characteristic 310 nm emission from Gd 3 + and broadband emission from Ce 3 + ions were obtained under X-ray excitations. The intensity of both Gd 3 + and Ce 3 + emission bands under 270 nm Gd 3 + excitations reduced with further increase in CeO 2 , showing the delayed energy transfer from Gd 3 + to Ce 3 + ions. The integrated X-ray-induced luminescence intensity of 0.5% CeO 2 glass was found to be 21% that of reference BGO crystal. For the lower concentration of CeO 2 , a slow decay time along with the fast Ce 3 + decay was observed and disappears for higher CeO 2 concentrations. The fast luminescence decay in the range of 22 ns-30 ns was observed for all the PSAG:Ce glasses, which was attributed to the lifetime of the 4f -5d transition of the Ce 3 + ions. The faster decay time and reasonable scintillation light suggest the application of these glasses for radiation detector applications.

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