Adjustable white luminescence and high thermal stability in Eu2+/Eu3+/Tb3+/Al co-doped aluminosilicate oxyfluoride glass

In this paper, Eu2+/Eu3+/Tb3+/Al co-doped aluminosilicate oxyfluoride glass samples were synthesized via melt-quenching method in air atmosphere. Their structural and optical properties were systematically investigated through X-ray diffraction patterns, X-ray photoelectron spectroscopy, absorption spectra and photoluminescent spectra. The proportion of Eu2+ and Eu3+ can be controlled effectively by using various amounts of Al powder, which results in an adjustable luminescence in the glass samples. By combining the orange-red emission of Eu3+ and blue broad emission of Eu2+ as well as green emission of Tb3+, a white light emission with quantum yields of 30.0% was generated. At 513 K, the emission intensity of the optimal G-0.5Eu0.2Al4Tb glass remains about 93.1% of its initial intensity at 303 K. Our research exhibits the potential application of Eu2+/Eu3+/Tb3+/Al co-doped aluminosilicate oxyfluoride glass samples in white light-emitting diode devices. (C) 2020 Elsevier B.V. All rights reserved.