Patent ID: 7800287

Claim:
A light emitting diode comprising: a die emitting blue light of a first frequency; a phosphor energized by light of said first frequency to emit light of a second frequency; and a filter interposed between said phosphor and said die, said filter having a reflectance of less than about 15% at wavelengths from about 350 nm to about 480 nm and a reflectance of greater than about 80% at wavelengths from about 510 nm to about 700 nm, said filter being comprised of alternating layers of Nb 2 O 5 and SiO 2 , wherein the Nb 2 O 5 layers vary in thickness from about 5 nm to about 100 nm and the SiO 2 layers vary in thickness from about 25 nm to about 125 nm.