Patent ID: 8222654

Claim:
A light emitting device comprising: a substrate having a predetermined pattern on a surface thereof by an etch, wherein the predetermined pattern includes a plurality of etched regions and a plurality of non-etched regions; a buffer layer on the substrate; a first conductive semiconductor layer on the buffer layer, wherein the first conductive semiconductor layer includes an InGaN layer, an AlGaN layer, and a GaN layer, and wherein the AlGaN layer has a planar surface; an active layer on the first conductive semiconductor layer; and a second conductive semiconductor layer on the active layer, wherein the plurality of non-etched regions are protruded from the plurality of etched regions, wherein a lower-most portion of each non-etched region of the plurality of non-etched regions has a width greater than an upper-most portion of each non-etched region of the plurality of non-etched regions, wherein the width of the lower-most portion of each non-etched region of the plurality of non-etched regions is in a range from 3 μm to 5 μm, wherein a distance between side surfaces of two non-etched regions of the plurality of non-etched regions is greater than a depth of an etched region of the plurality of etched regions, wherein a side surface of each non-etched region of the plurality of non-etched regions includes a convex surface, wherein the second conductive semiconductor layer comprises a delta-doped layer, and wherein the buffer layer completely covers the plurality of non-etched regions.