Patent ID: 6630691
Filing Date: 2003-10-07
Classification: H01L

Abstract:
A light emitting diode device for generating white light, the light emitting diode device comprising:a light emitting structure, the light emitting structure emitting primary radiation of a particular wavelength when driven; and a light-transmissive substrate comprising a Yttrium-Aluminum-oxide compound, at least a portion of the primary radiation emitted from the light emitting structure propagating into the substrate, the substrate being doped in such a manner that at least a portion of the primary radiation propagating into the substrate is converted into radiation of one or more other wavelengths, and wherein a portion of the primary radiation emitted by the light emitting structure is not converted into said radiation of one or more other wavelengths, and wherein the unconverted portion of the primary radiation combines with said radiation of one or more other wavelengths to produce white light.