E. Kaewnuam, N. Wantana, J. Rajagukguk, J. Kaewkhao
Tb 3+ doped calcium gadolinium silica borate glasses (CaGdSiB:Tb 3+ ) were prepared to study the influence of Gd 2 O 3 concentration on physical, glass network, optical and luminescence properties. Glass density and molar volume increased with increment of Gd 2 O 3 concentration. The enlargement of molar volume and evolution of FTIR spectra confirmed the non-bridging oxygen more occurring in glass network with increment of Gd 2 O 3 . Tb 3+ in glass absorbed photons in visible light and near-infrared region. Glass exhibited the strongest luminescence intensity of Tb 3+ at 542 nm under 275 nm excitation, passing through the Gd 3+ - Tb 3+ energy transfer. The overall color of emission is green in CIE 1931 chromaticity. The emission intensity did not show clear relation with Gd 2 O 3 concentration. However, glass with 22.5 mol% of Gd 2 O 3 possessed the highest emission intensity. The luminescence decay times of Tb 3+ was about 2 ms which decreased via increasing of Gd 2 O 3 content. CaGdSiB:Tb 3+ glass performs the potential for using as a scintillator for detector with integration mode and a green light source medium. © Published under licence by IOP Publishing Ltd.
Physics Program, Faculty of Science and Technology, Muban Chombueng Rajabhat University, Ratchaburi, 70150, Thailand; Physics Program, Faculty of Science and Technology, Nakhon Pathom Rajabhat University, Nakhon Pathom, 73000, Thailand; Center of Excellence in Glass Technology and Materials Science (CEGM), Nakhon Pathom Rajabhat University, Nakhon Pathom, 73000, Thailand; Department of Physics, Faculty of Mathematics and Natural Science, Universitas Negeri Medan, Indonesia
