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Europium-activated phosphors containing oxides of rare-earth and group-IIIB metals and method of making the same

United States Patent

July 13, 2004
View the Complete Patent at the US Patent & Trademark Office
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.
Comanzo; Holly Ann (Niskayuna, NY), Setlur; Anant Achyut (Niskayuna, NY), Srivastava; Alok Mani (Niskayuna, NY), Manivannan; Venkatesan (Clifton Park, NY)
General Electric Company (Niskayuna, NY)
10/ 064,121
June 12, 2002
FEDERAL RESEARCH STATEMENT This invention was first conceived or reduced to practice in the performance of work under contract DE-FC26-99FT40632 awarded by the United States Department of Energy. The United States of America may have certain rights to this invention.