Patent ID: 8963183
Filing Date: 2015-02-24
Classification: H01L

Abstract:
1. A light-emitting diode (LED), comprising: a substrate having a first surface and an opposing second surface; a light-emitting structure disposed on the first surface of the substrate, the light-emitting structure comprising: refractive index-grading layers covering at least a portion of the second conductivity-type semiconductor layer, the refractive index-grading layers having different refractive indices from each other; and a distributed Bragg reflector disposed on the second surface of the substrate, wherein the distributed Bragg reflector has a reflectivity of at least 90% with respect to blue light, green light, and red light, wherein the refractive index-grading layers comprise a first grading layer that is configured as a current spreading layer and directly contacts the light-emitting structure, and a second grading layer that is configured as an insulation layer, and wherein both of the first grading layer and the second grading layer have a refractive index that decreases in a direction away from the light-emitting structure.