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Blue-green phosphor for fluorescent lighting applications

United States Patent

March 15, 2005
View the Complete Patent at the US Patent & Trademark Office
A fluorescent lamp including a phosphor layer including Sr.sub.4 Al.sub.14 O.sub.25 :Eu.sup.2+ (SAE) and at least one of each of a red, green and blue emitting phosphor. The phosphor layer can optionally include an additional, deep red phosphor and a yellow emitting phosphor. The resulting lamp will exhibit a white light having a color rendering index of 90 or higher with a correlated color temperature of from 2500 to 10000 Kelvin. The use of SAE in phosphor blends of lamps results in high CRI light sources with increased stability and acceptable lumen maintenance over, the course of the lamp life.
Srivastava; Alok (Niskayuna, NY), Comanzo; Holly (Niskayuna, NY), Manivannan; Venkatesan (Recford, NY), Setlur; Anant Achyut (Niskayuna, NY)
General Electric Company (Schenectady, NY)
10/ 317,372
December 12, 2002
The U.S. Government has a paid-up license in this invention and the right in limited circumstances to require the patent owner to license others on reasonable terms as provided for by the terms of Contract No. DE-FC26-99FT40632 awarded by the Department of Energy.