Light emitting devices

Abstract

Light-emitting devices, and related components, systems and methods are disclosed.

1 . 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; and 
 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.