Patent ID: 9543467
Date: 2017-01-10
CPC Classifications: B82Y,H01L

Claim:
1. A light emitting device comprising: a first conductive semiconductor layer; an active layer over a top surface of the first conductive semiconductor layer; a second conductive semiconductor layer over a top surface of the active layer; a superlattice structure layer over a top surface of the second conductive semiconductor layer, the superlattice structure layer having a multi-layer structure; a first current spreading layer over a top surface of the superlattice structure layer, the first current spreading layer including a group III nitride-based conductive thin film; a second current spreading layer over a top surface of the first current spreading layer, the second current spreading layer including a transmissive conductive thin film; a third current spreading layer over a top surface the second current spreading layer, the third current spreading layer including a reflective conductive thin film; and a second electrode layer on the reflective conductive thin film, wherein the top surface of the first current spreading layer comprises a first light extracting structure having a concave pattern or a convex pattern; wherein the first current spreading layer forms an ohmic contact interface with respect to the superlattice structure layer, wherein a material of the first light extracting structure is same as a material of the first current spreading layer, wherein the superlattice structure layer is directly in contact with the second conductive semiconductor layer, and wherein the transmissive conductive thin film is spaced apart from the superlattice structure layer.