Patent ID: 7166870

Claim:
A light-emitting device, comprising: a multi-layer stack of materials including a layer of n-doped material, a layer of p-doped material, and a light-generating region; and a layer of reflective material that is capable of reflecting at least about 50% of light generated by the light-generating region that impinges on the layer of reflective material, wherein: a surface of the layer of n-doped material is configured so that light generated by the light-generating region can emerge from the light-emitting device via the surface of the layer of n-doped material; the surface of the layer of n-doped material has a dielectric function that varies spatially according to a pattern, the pattern is configured so that light emitted by the surface of the layer of n-doped material has a spectrum of radiation modes, and the spectrum of radiation modes is substantially the same as a characteristic emission spectrum of the light-generating region: a distance between the layer of p-doped material and the layer of reflective material is less than a distance between the layer of n-doped material and the layer of reflective material; and the layer of n-doped material is supported by the layer of p-doped material.