Photoluminescence of Sm3+ and Eu3+ co-doped La2O3-Ga2O3 glasses fabricated by an aerodynamic levitation furnace

A series of transparent (1-y)La2O3-Ga2O3-ySm2O3-xEu2O3 y )La 2 O 3 - Ga 2 O 3- y Sm 2 O 3- x Eu 2 O 3 (where x = 0, 0.02, 0.04, 0.06, 0.08, 0.10, 0.12, 0.14, and y = 0, 0.04) were successfully synthesized using a containerless solidification process. Co-doping with Sm3+ 3 + and Eu3+ 3 + enhanced the energy absorption of Eu3+, 3 + , notably improving the characteristic emission peak 5 D 0-7F2 7 F 2 of Eu3+. 3 + . The peak emission intensity for y = 0.04 was observed at x = 0.08, attributable to the concentration quenching of Eu3+ 3 + ions. As the concentration of Eu3+ 3 + increased, the energy transfer effect on emission intensity diminished. Attributed to the energy transfer between Sm3+ 3 + and Eu3+, 3 + , Sm3+ 3 + may primarily serve as the sensitizer, and Eu3+ 3 + as the activator. According to the Dexter theory, which suggests that the interaction between activator ions and their adjacent ions is the primary mechanism of energy transfer and quenching among Eu3+ 3 + ions and adjacent ions, an increase in Eu3+ 3 + concentration leads to a decrease in the distance between Eu3+ 3 + and adjacent ions, strengthening their interaction, and potentially inducing concentration quenching. Furthermore, with an increase in Eu3+ 3 + concentration, the CIE chromaticity coordinates for the samples co-doped with Sm3+ 3 + and Eu3+ 3 + shifted significantly, enhancing the color purity of the emitted light and bringing it closer to the NTSC color standard coordinates (0.67, 0.33).