Abstract: A method of making a lanthanum cerium terbium phosphate phosphor involves the single-step reaction of single-phase, mixed valence state lanthanum cerium terbium oxide with boron phosphate in the presence of a flux-forming compound containing lithium. The resulting phosphor is up to 5% brighter than the same phosphor prepared without the lithium-containing compound.

Abstract: A method of making a lanthanum cerium terbium phosphate phosphor involves the single-step reaction of a single-phase, mixed valence state lanthanum cerium terbium oxide and boron phosphate. Alternatively, the single-step reaction may involve a mixture of lanthanum oxide, cerium oxide, terbium oxide and boron phosphate.

Abstract: A method is disclosed for reproducibly producing manganese activated zinc silicate phosphor particles, which comprises dry blending a mixture of components consisting essentially of zinc oxide, silicic acid, a source of manganese, ammonium chloride, ammonium fluoride, tungstic oxide, and silica, wherein the Zu+Mn/Si mole ratio is from about 1.95 to about 2.02, wherein the silica is colloidal and has a surface area of from about 50 to about 410 m.sup.2 per gram, and wherein the colloidal silica makes up from about 0.01% to about 1.0% by weight of the mixture, and firing the resulting dry blend of components in a nitrogen atmosphere at a temperature of from about 1200.degree. C. to about 1300.degree. C. for a sufficient time to produce the phosphor wherein the phosphor exhibits reproducible brightness.

Abstract: A process is disclosed for producing a europium activated strontium borate phosphor having a strontium containing coating. The process involves washing a europium activated strontium borate phosphor with a solution of strontium hydroxide to produce a first washed phosphor followed by removing the first washed phosphor from the resulting wash solution. The first washed phosphor is washed with a wash solution selected from the group consisting of ammonium fluoride in alcohol, ammonium bifluoride in alcohol, and a strontium salt in ammonium hydroxide, followed by removing the resulting second washed phosphor from the resulting wash solution. The second washed phosphor is then heated to produce the coated phosphor.