Improved europium-activated phosphors containing oxides of rare-earth and Group III metals

文件类型：PDF文档
文件大小：586K
Europium-activated phosphors comprise oxides of at least a rare-earth metal selected from the group consisting of gadolinium, yttrium, lanthanum, and combinations thereof and at least a Group-IIIB metal selected from the group consisting of aluminum, gallium, indium, and combinations thereof A method for making such phosphors comprises adding at least a halide of at least one of the selected Group-IIIB metals in a starting mixture. The method further comprises firing the starting mixture in an oxygen-containing atmosphere. The phosphors produced by such a method exhibit improved absorption in the UV wavelength range and improved quantum efficiency. Also shown is a phosphor blend comprising the above europium-activated phosphor and a light source comprising the phosphor blend.