UV light and X-ray induced luminescence properties of Eu3+and Tb3+single-doped and double-doped phosphosilicate glasses for LED and scintillator applications

초록

Eu3+ and Tb3+ single-doped and co-doped phosposilicate (P2O5 +SiO2) glasses with the insertion of fluorides (NaF+BaF2+AlF3) were fabricated. Absorption and excitation spectra of glasses were studied. With two different (218 and 378 nm) excitations of Eu3+ and Tb3+, the visible emission spectra (450-750 nm) consisting of RGB (red-green-blue) colors were obtained. The multipolar interactions involved in the energy transfer (ET) between Eu3+ and Tb3+ were analyzed through Reisfeld and Dexter's theory. The lifetimes of the co-doped glasses for the 5 D 0 emission (lambda ex=378 nm) of Eu3+ and the 5 D 4 emission (lambda ex=218 nm) of Tb3+ ions were obtained. Further, the asymmetric ratios, integrated intensities, R/G ratios, and ET efficiencies were also evaluated. The scintillation efficiency of glasses determined from radio luminescence (X-ray) was found to be 62%. The color coordinates of the glasses were moved to yellowish-green zone with the CCT (correlative color temperatures) of <= 4037 K.

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