Radiation-induced Luminescence Characteristics of Ce-doped La2O3–Al2O3 Glasses Prepared by Gas Levitation Furnace

In this study, Ce-doped La 2 O 3 -Al 2 O 3 glasses were prepared by the levitation method, a containerless glass-making method, and their optical and radiation-induced luminescence properties were investigated.From the Raman spectral analysis, it was observed that an increase in La 2 O 3 content correlates with an increase in the number of non-bridging oxygen (NBO) atoms arising from the reduction in the number of AlO 4 units, and a decrease in the number of highcoordination aluminum species such as AlO 5 and AlO 6 .Variations in glass composition also affect the luminescent properties.In samples with lower La 2 O 3 content, two types of emission were observed: one from typical Ce 3+ ions and the other from Ce-O associates.However, as the La 2 O 3 content increased, the emission from Ce-O associates diminished and ultimately disappeared.In the scintillation spectra, the luminescence from Ce-O associates was barely observed, whereas that from the 5d-4f transition of Ce 3+ was dominant.Since the emission intensity is affected by the number of carrier traps, the Ce-doped La 2 O 3 -Al 2 O 3 glass can function as both a scintillator and a dosimeter material by optimizing the glass composition.