Patent ID: 7367691

Claim:
A light emitting device comprising: a light-generating unit for generating a primary light in a first wavelength range; a wavelength-converting member connected to said light-generating unit, wherein the wavelength-converting member has a material layer used to convert a portion of said primary light into a secondary light in a second wavelength range wherein said primary light in wavelength is shorter than said secondary light; and at least an omnidirectional reflector of an omnidirectional photonic crystal connected to said wavelength-converting member for receiving said secondary light and the remainder of said primary light which was not converted by said wavelength-converting member; wherein said reflector includes a dielectric structure having a plurality of dielectric units that are formed into a stack with a spatially periodic variation in dielectric constant, each of the dielectric units including at least three dielectric layers which are different from each other in reflective index and layer thickness in such as manner that said reflector has a transmittance characteristic that permits transmission of said secondary light therethrough, and a reflectance characteristic that substantially permits omnidirectional total reflection of the remainder of said primary light back to said wavelength-converting member.