LAUSR

Abstract A series of Lu3-xAl5O12:xCe3+ green phosphors with excellent morphology and high luminescence efficiency were prepared by adding different fluxes (H3BO3, NaF, and BaF2). The results show that fluxes do not affect the crystal structure but can improve the morphology and luminescence intensity. The optimum of H3BO3, NaF, BaF2 are 1.0 wt%, 15 wt%, 12 wt% and the luminescence intensity increased by 85%, 35%, 17% compare to the non-flux sample, respectively. The luminescence intensity and thermal stability of samples prepared by composite fluxes have been enhanced because of uniform particle size with nearly spherical morphology. The luminescence intensity of the sample prepared by 1.5 wt% H3BO3+15 wt% NaF is 88% higher than without adding flux, 1.0 wt% H3BO3+12 wt% BaF2 increased by 103%. Moreover, the luminescence intensity of the sample prepared by 1.5 wt% H3BO3+12 wt% BaF2 is 6% higher than non-flux at 200 °C. This has mainly been attributed to the significantly improved fluidity of high-temperature viscous reactions, the particles have the same growth trend in all directions, so the particle size and morphology of Lu3Al5O12:Ce3+ have been optimized. This study provides an effective strategy for improving the luminescence intensity and thermal stability of Lu3Al5O12:Ce3+.