Energy transfer and tunable luminescent properties in Eu2+/Tb3+/Eu3+ co-doped oxyfluoride aluminosilicate glass

A series of Eu2+/Tb3+/Eu3+ co-doped oxyfluoride aluminosilicate glass samples were synthesized by using the melt-quenching method in air atmosphere. Transmission spectra, excitation and emission spectra, decay curves and temperature-dependent emission spectra were utilized to investigate their luminescent properties systematically. Under near-ultraviolet excitation, adjustable white light emission is generated as a result of efficient energy transfer from Eu2+ to Tb3+ and from Tb3+ to Eu3+. Furthermore, the Eu2+/Tb3+/Eu3+ co-doped glass presents good thermal stability. At 423 K, the emission intensity of the optimal G-5Tb4Eu glass remains about 86% of its initial intensity at 298 K. These excellent properties indicate that Eu2+/Tb3+/Eu3+ co-doped oxyfluoride aluminosilicate glass may provide a new platform for designing and fabricating W-LEDs devices in the future.