Patent ID: 8232567

Claim:
A light emitting device, comprising: a substrate; a first semiconductor layer disposed on a surface of said substrate; an active layer disposed on a first portion surface of said first semiconductor layer; a second semiconductor layer disposed on said active layer; a transparent conductive layer disposed on said second semiconductor layer; and a plurality of pillar structures disposed on a second portion surface of said first semiconductor layer, said plurality of pillar structures having a hollow structure therein, and said plurality of pillar structures being separated from each other, wherein each said plurality of pillar structures from top to bottom comprises said second semiconductor layer, said active layer, and said first semiconductor layer, wherein the depth of said hollow structure of each said plurality of pillar structures respectively extends down from said second semiconductor layer until an arbitrary depth of said second semiconductor layer, from said second semiconductor layer until an exposed surface of said active layer, from said second semiconductor layer until an arbitrary depth of said active layer, from said second semiconductor layer through said active layer until an exposed surface of said first semiconductor layer, from said second semiconductor layer through said active layer until an arbitrary depth of said first semiconductor layer, and from said second semiconductor layer through said active layer and extended down until a bottom portion of said first semiconductor layer.