Synthesis and Photoluminescence Properties of Sr[sub 2]Si[sub 5]N[sub 8]:Eu[sup 2+] Red Phosphor by a Gas-Reduction and Nitridation Method

Abstract

Eu2+Eu2+ -activated Sr2Si5N8Sr2Si5N8 red phosphor for white light-emitting diodes was successfully synthesized by an innovative, simple and efficient synthetic process, direct gas-reduction and nitridation of the homogeneous oxide precursor of the SrO–SiO2–Eu2O3SrO–SiO2–Eu2O3 system in the flowing NH3NH3 and CH4CH4 mixture gas. The phase purity, morphology, and luminescence properties were investigated. The synthesized powders have a pure Sr2Si5N8Sr2Si5N8 phase and consist of fine, sub-micrometer-sized particles. Under the blue light excitation, Sr2Si5N8:Eu2+Sr2Si5N8:Eu2+ phosphor shows excellent luminescence properties, such as high emission intensity, high quantum efficiency, and very low thermal quenching, which is comparable to those of phosphors fabricated by the solid-state reaction method.