Preparation and properties of Dy3+/Tb3+/Sm3+ doped GeO2-B2O3–Na2O–SrO-Ga2O3 luminescent glass

Dy3+/Sm3+ double-doped, Tb3+/Sm3+ double-doped and Dy3+/Tb3+/Sm3+ triple-doped GeO2-B2O3–Na2O–SrO-Ga2O3 (GBNSG) luminescent glass was prepared by high temperature melting method, and its structure, energy transfer mode, luminescence properties and thermal stability were studied. The results show that Dy3+/Sm3+ double-doped GBNSG luminescent glass transfers energy from Dy3+ to Sm3+ in an electric dipole-electric dipole manner, with an energy transfer efficiency of 87.56%. Tb3+/Sm3+ double-doped GBNSG luminescent glass in which Tb3+ transfers energy to Sm3+ in an electric-dipole-electric-dipole fashion, with an energy transfer efficiency of 92.24%. The decreasing fluorescence decay lifetime of Dy3+ in Dy3+/Tb3+/Sm3+ triple-doped GBNSG luminescent glass indicates that Dy3+ transfers energy to Tb3+ and Sm3+. The CIE chromaticity coordinates of GBNSG-0.5Dy3+/0.8 Tb3+/1.0Sm3+ luminous glass are (0.3387, 0.3374), and the correlation color temperature is 5228 K, which realizes the white light emission. The ΔE of GBNG-0.5Dy3+/0.8 Tb3+/1.0Sm3+ luminous glass is up to 0.246 eV, indicating that it has good thermal stability.