Phosphors for light generation from light emitting semiconductors
 The phosphor A.sub.2 DSi.sub.2 O.sub.7 :Eu.sup.2+, where A is at least one of Ba, Sr, Ca and D is Mg and Zn absorbs UV light, for example from an LED, and converts the UV light to green light. The phosphor can be combined with a red phosphor such as Y.sub.2 O.sub.3 :Eu.sup.3+,Bi.sup.3+ and one or more blue phosphors such as SECA ((Sr,Ba,Ca).sub.5 (PO.sub.4).sub.3 Cl:Eu.sup.2+) and BAM (BaMg.sub.2 Al.sub.16 O.sub.27 :Eu.sup.2+) to produce white light. Also, a light emitting apparatus is disclosed which comprises at least one of a red, green and blue phosphor for absorbing and converting ultraviolet radiation from a light emitting semiconductor into visible light. A laser diode can be used to activate the phosphors to provide improved efficiency and brightness. 
General Electric Company
H C Y
H01L C09K Y02B
inventional inventional additional
Anil Raj Alok Mani
Duggal Srivastava