Tm3+/Dy3+ co-doped BaO–B2O3–P2O5–Na2O glass and NaBaPO4 glass-ceramic for white LED

In this work, Tm3+/Dy3+ co-doped BaO–B2O3–P2O5–Na2O glass was prepared by high temperature melting method and NaBaPO4 glass-ceramics can be obtained by heat treatment of precursor glass at 580 °C for 4 h. The structures of BaO–B2O3–P2O5–Na2O glasses and NaBaPO4 glass ceramics were investigated by FT-IR spectroscopy and Raman spectroscopy. The transmission spectrum shows that the transmittances of glass and glass-ceramic at the visible light scope reach 90% and 80%, respectively. The photoluminescence performance, energy transfer progress and luminescence mechanism were investigated simultaneously. The emitting color can be adjusted through the concentrations of Dy3+ and Tm3+ ions. Under the excitation of 354 nm ultraviolet light, the color temperature (5610.7K) and color coordinate (0.3303, 0.3077) of the glass, and color temperature 5563.8K, color coordinate (0.3311, 0.3111) of the NaBaPO4 glass-ceramic, which is close to the standard white light (5454.12 K, (0.3333, 0.3333)), can be achieved. The luminous intensity of glass-ceramic is much higher than that of precursor glass. The above result shows that Tm3+/Dy3+ co-doped BaO–B2O3–P2O5–Na2O glass and NaBaPO4 glass ceramics have latent application value in the territory of white LED and light-emitting display.