Effect of various additives on fluorescent intensity of GeO2·SiO2 phosphor

In this study, the effect of the molar ratio between the GeO2 and SiO2 components of the violet-blue GeO2·SiO2 phosphor glass on its photoluminescence (PL) activity has been examined. The strongest PL intensity was observed for the (GeO2)20(SiO2)80 compound, and its room-temperature internal quantum efficiency estimated at an excitation wavelength of 250 nm was 53%. This value was further increased by the addition of Al and Zr elements to the (GeO2)20(SiO2)80 phosphor, and the internal quantum efficiencies of the resulting (GeO2)20(SiO2)80 + 2000 ppm Zr and (GeO2)20(SiO2)80 + 1000 ppm Al systems measured at room temperature were equal to 66 and 70%, respectively.