J. Rajagukguk, Juniar Hutahaean, Howard Situmorang, C.S. Sarumaha, E. Simanullang, A. Angnanon, Y. Ruangtaweep, S. Kothan, P. Limsuwan, J. Kaewkhao
A series of mixed silicate-phosphate glasses co-doped with Gd3+/Tb3+ ions at varying Tb concentrations were successfully synthesized using the melt-quenching technique. Their physical, optical and luminescence properties were analyzed, with an emphasis on the role of Tb3+ concentration. The photoluminescence (PL) spectra exhibit characteristic emission bands corresponding to Gd3+ and Tb3+ ions. A gradual decrease in the Gd3+ emission intensity at 311 nm is observed, accompanied by the suppression of Tb3+ emissions originating from the 5D3 level. In contrast, a significant enhancement of the green emission associated with the Tb3+5D4 → 7Fj transitions is clearly evident. Under X-ray excitation, the radioluminescence (RL) spectra of the glasses displayed multiple sharp emission peaks corresponding to Tb3+ transitions, in contrast to the broad 478 nm emission band of the BGO crystal. Integral RL intensity ratios were demonstrated; all glasses exhibit significant radioluminescence intensity under X-Ray excitation compared to BGO, with QSPCaBaGd5Tb2.0 showing the highest performance reaches up to 52.09% in the 350-800 nm range. These results, together with X-ray imaging capability, demonstrate that the developed glasses are promising candidates for cost-effective scintillation applications. Copyright © 2026. Published by Elsevier Ltd.
Department of Physics, Faculty of Mathematics and Natural Sciences, Universitas Negeri Medan, Medan, 20221, Indonesia; Faculty of Science and Technology, Muban Chombueng Rajabhat University, Ratchaburi, 70150, Thailand; Center of Excellence in Glass Technology and Materials Science (CEGM), Nakhon Pathom Rajabhat University, Nakhon Pathom, 73000, Thailand; Center of Radiation Research and Medical Imaging, Department of Radiologic Technology, Faculty of Associated Medical Sciences, Chiang Mai University, Chiang Mai, 50200, Thailand; Office of Research Administration, Chiang Mai University, Chiang Mai, 50200, Thailand; Physics Program, Faculty of Science and Technology, Nakhon Pathom Rajabhat University, Nakhon Pathom, 73000, Thailand; Department of Physics, Faculty of Science, King Mongkut's Institute of Technology Ladkrabang, Bangkok, 10140, Thailand
