Enhanced photoluminescence and radioluminescence of Dy3+-doped Ba–Na–B glasses

Abstract

This research aims to study the photoluminescence and radioluminescence enhancement for Dy3+-doped Ba–Na–B glasses by (1) adding fluoride contain to the host glass and (2) adding Gd3+ to the glass compositions. The absorption spectra show 7 absorption bands in UV-Vis-NIR regions, assigned by 6H15/2 → 6P7/2 (347 nm), 4I15/2 (452 nm), 6F5/2 (796 nm), 6F7/2 (898 nm), 6F9/2 (1089 nm), 6H9/2 (1265 nm) and 6H11/2 (1674 nm). The excitation spectra show the most intense excitation wavelength at 350 nm. The emission spectra, excited with 350 nm, show the two major emission bands at 482 nm (4F9/2 → 6H15/2) and 575 nm (4F9/2 → 6H13/2). The emitted light is located in the white region, according to CIE 1931 chromaticity diagram. For fluoride adding study, 10BaO:25Na2O:64B2O3:1Dy2O3 (DyO) and 10BaO:25NaF:64B2O3:1Dy2O3 (DyF) were fabricated. The emission intensity of the DyF glass is higher than the DyO glass. For Gd3+ adding study, the 10BaO:25Na2O:(64-x)B2O3:1Dy2O3:xGd2O3 (x = 0, 2.5, 5, 7.5 and 10 mol%) were fabricated. For the photoluminescence, the glass sample with 5 mol% of Gd3+ ions provided the highest emission light yield. For the radioluminescence, the glass sample with 2.5 mol% of Gd3+ ions provided the highest scintillation potential at 14.15% compared with the BGO scintillation crystal.