Patent ID: 7829905

Claim:
A semiconductor light emitting device for emission of light having a predetermined bandwidth in a primary direction of emission, the device comprising: a light generating region for the generation of light; a multi-layer stack of materials including a layer of p-doped material and a layer of n-doped material, each adjacent to the light generating region, respectively, the multi-layer stack having an upper emitting surface and an opposed lower emitting surface; a 2-dimensional photonic crystal structure located at or adjacent the upper emitting surface of said multi-layer stack for extraction of light of said predetermined bandwidth; an electrically conductive and transparent substrate disposed adjacent the lower emitting surface of the multi layer stack of materials, said substrate extending across and being in electrical communication across the lower emitting surface of said multi-layer stack of materials, and being transparent to at least a segment of light of said predetermined bandwidth emitted via the lower emitting surface of the multi layer stack of materials; an n-electrode in electrical communication with the electrically conductive and transparent substrate at a first portion and a second portion of said substrate, said first portion and said second portion being spaced apart from each other; and a 1-dimensional photonic crystal structure having a photonic bandgap covering at least said segment of light of said predetermined bandwidth, said 1-dimensional crystal structure being located distal of the 2-dimensional photonic crystal structure and being located adjacent the lower emitting surface of said multi layer stack and being interposed between said first portion and said second portion of the substrate where said n-electrode is in electrical communication with the substrate, wherein the 1-dimensional photonic crystal structure is of a predetermined thickness so as to substantially reflect said segment of light of said predetermined wavelength emitted via the lower emitting surface of the multi layer stack of materials back in the primary direction of emission and back toward the 2-dimensional photonic crystal structure, and wherein said substrate provides electrical connection from the n-electrode to the multi layer stack of materials across the lower emitting surface of the multi layer stack of materials, and allows transmission therethrough of the light reflected from the 1-dimensional photonic crystal and across the lower emitting surface of the multi layer stack of materials in the primary direction of emission.