Structural and luminescence investigation of Ce³⁺ doped lithium barium gadolinium phosphate glass scintillator

Abstract

Cerium-doped lithium barium gadolinium phosphate glass to with various concentration of Gadolinium and cerium have been investigated for this physical and optical properties. The density was determined by Archimedes' principle showed the relation of density and reflective index which depended on Gd2O3 and CeF3 concentrations. Their optical properties were investigated by luminescence spectra under UV and x-rays excitations. The emission and excitation spectra of Ce3+ ion exhibited strong intensity at 338–346 nm (λEX = 302 nm) and at 332–342 nm (λEX = 302 nm) with the concentration of Gd2O3 at 18 %mol for various concentration of Gd2O3 and concentration of CeF3 at 1.0 mol%, respectively. The UV–Vis transmission spectra showed the red shift with the higher concentration of Gd2O3. The oxidation of Ce3+ ions and Ce4+ ions of samples were demonstrated by using X-ray Absorption Near Edge spectroscopy (XANE). In addition, the decay time of samples are very short, in the range of 14–16 ns, which is an important property to improve to the radiation detector. The energy loss by alpha particle was calculated by SRIM program. The result showed the stopping ions range were increased with increasing of alpha energy.