L. Yuliantini, M. Djamal, R. Hidayat, K. Boonin, P. Yasaka, E. Kaewnuam, V. Venkatramu, J. Kaewkhao
Borotellurite and fluoroborotellurite glasses doped with Sm3+ ions were synthesized and studied their physical, photoluminescence, x-ray induced luminescence, and fluorescence decays. The glasses that were prepared by melt quenching technique were labelled by BTZOS for 30B2O3 + 29TeO2 + 30BaO + 10ZnO + 1Sm2O3 and BTZFS for 30B2O3 + 29TeO2 + 30BaO + 10ZnF2 + 1Sm2O3. The glass becomes more transparent when ZnO was replaced by ZnF2. It was found that the replacement of ZnO by ZnF2 increases absorbance and luminescence of Sm3+ ions. The Judd - Ofelt intensity parameters were evaluated from measured absorption spectra for BTZOS and BTZFS glasses and their trend is found to be Ω2 > Ω4 > Ω6. The sharp and intense emission peak was originated from 4G5/2 → 6H7/2 transition centred at 600 nm under 403 nm excitation. The colour coordinates of BTZOS and BTZFS glasses are found to fall in the orange region with CCT <4000 K, suitable for solid-state lighting. BTZFS glass exhibits better radiative properties such as long lifetime, higher quantum efficiency (η), radiative transition probability (AR), stimulated emission cross-sections (σe), branching ratios (β), gain bandwidth and figure of merit, lower non-radiative decay rate (WCR)and saturation intensity (Is)than BTZOS glass. From the analysis of the results, it is concluded that BTZFS glass could be more suitable for a gain medium for lasers in the visible region. © 2019 Elsevier B.V.
Department of Physics, Faculty of Mathematics and Natural Sciences, Institut Teknologi Bandung, Bandung, 40132, Indonesia; Physics Study Program, Department of Science, Institut Teknologi Sumatera, Lampung, 35365, Indonesia; Center of Excellence in Glass Technology and Materials Science (CEGM), Nakhon Pathom Rajabhat University, Nakhon Pathom, 73000, Thailand; Physics Program, Faculty of Science and Technology, Nakhon Pathom Rajabhat University, Nakhon Pathom, 73000, Thailand; Physics Program, Faculty of Science and Technology, Muban Chombueng Rajabhat University, Ratchaburi, 70150, Thailand; Department of Physics, Yogi Vemana University, Kadapa, 516 005, India; Department of Physics, Krishna University, Dr. MRAR PG Centre, Nuzvid, 521 201, India
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