Orange-red emitting Eu2+-activated (Sr0.883Ba0.1Lu0.0.17)3(Si0.95Al0.05)O5 phosphor: structure, photoluminescence, and application in white LEDs

Orange-red emitting (Sr0.883-xBa0.1Lu0.0.17Eux)3(Si0.95Al0.05)O5 phosphors were synthesized by conventional solid-state reaction. The effect of NH4F flux on structural and luminescent properties of phosphors was investigated. Results suggested that the optimal content of NH4F flux was 3 wt.% and the optimal doping concentration of Eu2+ was x=0.023 mol. The phosphors showed intense absorption in near-ultraviolet to blue region and exhibited orange-red emissions. The thermal stability of synthesized (Sr0.86Ba0.1Lu0.017Eu0.023)3(Si0.95Al0.05)O5 phosphor were examined and compared with commercial YAG:Ce3+ yellow phosphors. Combining an InGaN blue 460 nm chip and a white-emitting (Sr0.86Ba0.1Lu0.017Eu0.023)3(Si0.95Al0.05)O5 phosphor produced a white- light LED, demonstrating CIE chromaticity coordinates of (0.314, 0.329) and a color temperature of 5595 K. All results showed that this phosphor is a promising candidate as orange-red emitting phosphor for white light emitting diode (w-LED) application.

Chromatic coordinates of white-emitting based on YAG:Ce3+(a), 95% YAG:Ce3+ and 5% SBLSAOE23 (b), and SBLSAOE23 (c) phosphorsFigure optionsDownload as PowerPoint slide