Synthesis of Ba3Si6O12N2:Eu2+ Green Phosphors Using Ba3SiO5:Eu2+ Precursor and Their Luminescent Properties

Green-emitting Ba3Si6O12N2:Eu2+ phosphors were synthesized by Ba3SiO5:Eu2+ precursor method, and their phase, morphology, photoluminescence (PL) properties were investigated. Contrary to the solid-state reaction technique, the precursor method yielded the single phase Ba3Si6O12N2:Eu2+ with a high PL intensity. The influence of calcination temperature, Si3N4 content, and Eu2+ doping concentration on the phase formation and PL properties were studied. As-synthesized Ba3Si6O12N2:Eu2+ phosphors showed a strong emission at 528 nm under the excitation of lambda(exc) = 400 nm, and the highest emission intensity was observed in Ba3-xSi6O12N2:Eu-x(2+) (x = 0.2) phosphor, which was calcined at 1400 degrees C in Si3N4 rich condition. The thermal stability of synthesized Ba3Si6O12N2:Eu2+ phosphor was examined and compared with that of commercial (Sr,Ba)(2)SiO4:Eu2+ and beta-SiAlON:Eu2+ green phosphors. (C) 2012 The Electrochemical Society. All rights reserved.