Synthesis of BaAl2S4:Eu2+Electroluminescent Material by the Polymerizable Complex Method Combined with CS2Sulfurization

Eu-activated BaAl2S4 (BaAl2S4:Eu) blue light emission phosphor has attracted considerable attention recently as a prospective material for full color electroluminescent display applications. Although BaAl2S4:Eu was discovered over 30 years ago, the solid-state reaction between metal sulfides in sealed quartz ampoules remains the main method for the synthesis of this material. In this work, a homogeneous single-phase Ba0.95Eu0.05Al2S4 (BaAl2S4:Eu) phosphor was obtained by the sulfurization–reduction of the multicomponent oxide precursor in a CS2 atmosphere at 1050°C. The oxide precursor containing barium, aluminum, and europium for this process was prepared by the polymerizable complex method, which ensures a high degree of homogeneity in the final product. The BaAl2S4:Eu material thus obtained exhibited a single emission line at 475 nm and a fluorescence intensity of 35% compared with one of the best commercially available (Ba,Eu)MgAl10O17 phosphors.