Patent Number: 6,294,800

Title: Phosphors for white light generation from UV emitting diodes

Abstract: Ca.sub.8 Mg(SiO.sub.4).sub.4 Cl.sub.2 :Eu.sup.2+,Mn.sup.2+ and Y.sub.2 O.sub.3 :Eu.sup.3+,Bi.sup.3+ are phosphors which have been sensitized to absorb ultraviolet radiation, such as from a light emitting diode, and to convert the radiation into visible light. A phosphor conversion material blend comprises Ca.sub.8 Mg(SiO.sub.4).sub.4 Cl.sub.2 :Eu.sup.2+,Mn.sup.2+ ; Y.sub.2 O.sub.3 :Eu.sup.3+,Bi.sup.3+, and known blue phosphors that absorb ultraviolet radiation from a LED and convert the radiation into visible bright white light. Also, a light emitting assembly comprises at least one of a red, green and blue phosphor for absorbing and converting ultraviolet radiation into visible light. A laser diode can be used to activate the phosphors to provide improved efficiency and brightness.

Inventors: Duggal; Anil Raj (Niskayuna, NY), Srivastava; Alok Mani (Schenectady, NY), Davenport; John Martin (Lyndhurst, OH), Soules; Thomas Frederick (Richmond Heights, OH), Beers; William Winder (Chesterland, OH)

Assignee: General Electric Company

International Classification: C09K 11/77 (20060101); H01L 33/00 (20060101); H01L 033/00 ()

Expiration Date: 09/25/2018