Visible Luminescence Properties of Ho3+ Doped High Density Germanate Glass Scintillators for X-Ray Ct

Abstract

Using the melt-quenching method, Ho³⁺ doped germanate glasses with high density have been prepared. The compositions of Ho3+ doped germanate glasses were 50GeO2-15Lu2O3-10BaO-10Al2O3-(15-x)La2O3-xHo2O3 (x=0, 0.25, 0.5, 0.75, 1.0, and 1.25, in mol%) and the density values of the samples were determined to be between 5.96 ± 0.02 and 6.05 ± 0.02 g/cm3. The physical and optical performance were expressed by differential scanning calorimetry, transmission spectra, fluorescence spectra, fluorescence decay, and XEL spectra. Excited by 449 nm light and X-ray, Ho3+ exhibits bright green emission around 553 nm. The 553 nm emission lifetimes of Ho3+ with lifetime on the order of microseconds were in the range of 43.54-52.03 μs. The results show the potential of Ho3+ doped germanate glasses with high density to be served as scintillators for X-ray CT.

Keywords: Germanate glass, Scintillating glass, Ho3+, Luminescent properties, High density