Patent ID: 8324652

Claim:
A device capable of emitting light about a predetermined wavelength in response to an applied electric current comprising: a substrate comprising first and second surfaces; a light emitting portion comprising a semiconductor material and first and second surfaces wherein the light is emitted from the first and second surfaces and the second surface is substantially coupled to the first surface of the substrate; a first layer coupled to the second surface of the substrate comprising an optically transmissive, dielectric layer with a refractive index less than the refractive index of the substrate and of a thickness greater than one-quarter wavelength of the predetermined wavelength divided by the index of refraction of the optically transmissive dielectric layer; one or more second layers coupled to the first layer wherein each second layer comprises a first dielectric layer of high-index of refraction and a second dielectric layer of low-index of refraction wherein the first dielectric layer is of a thickness about mλ/4n H , and the second dielectric layer is of a thickness about kλ/4n L , where m and k are odd integers, λ is the predetermined nominal wavelength in air, n H is the refractive index of the high-index of refraction dielectric layer and n L is the refractive index of the low-index of refraction dielectric layer; and a metallic layer coupled to the one or more second layers; wherein the reflectivity of the metallic layer to the predetermined wavelength is greater than about 50 percent.