Patent ID: 7511307
Filing Date: 2009-03-31
Classification: H01L

Abstract:
1. A light emitting device, comprising: a light-enhancing layered structure of a hexagonal crystal system, said light-enhancing layered structure including a light-enhancing layer having a planar surface that is formed with a plurality of light-enhancing units thereon, each of said light-enhancing units extending in a normal direction relative to said planar surface, being tapered from said planar surface, and having three inclined faces that are adjoined side-by-side and that are respectively parallel to corresponding symmetrical ones of the crystal planes {11 a light emitting layered structure formed on said light-enhancing layered structure; wherein each of said light-enhancing units is in the form of a recessed wall that defines a recess indented inwardly from said planar surface of said light-enhancing layer, and that has a peripheral wall portion defining said inclined faces; wherein said light-enhancing layered structure further includes a buffer layer formed on said planar surface of said light-enhancing layer and formed with a plurality of protrusions extending respectively into said recesses of said light-enhancing units; and wherein each of said protrusions intersects said inclined faces of said recessed wall of the respective one of said light-enhancing units so as to form closed cavities therebetween.