Abstract
Tb3+ doped calcium gadolinium silica borate glasses (CaGdSiB:Tb3+) were prepared to study the influence of Gd2O3 concentration on physical, glass network, optical and luminescence properties. Glass density and molar volume increased with increment of Gd2O3 concentration. The enlargement of molar volume and evolution of FTIR spectra confirmed the non-bridging oxygen more occurring in glass network with increment of Gd2O3. Tb3+ in glass absorbed photons in visible light and near-infrared region. Glass exhibited the strongest luminescence intensity of Tb3+ at 542 nm under 275 nm excitation, passing through the Gd3+ - Tb3+ energy transfer. The overall color of emission is green in CIE 1931 chromaticity. The emission intensity did not show clear relation with Gd2O3 concentration. However, glass with 22.5 mol% of Gd2O3 possessed the highest emission intensity. The luminescence decay times of Tb3+ was about 2 ms which decreased via increasing of Gd2O3 content. CaGdSiB:Tb3+ glass performs the potential for using as a scintillator for detector with integration mode and a green light source medium.
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