Patent ID: 8384106
Filing Date: 2013-02-26
Classification: H01L

Abstract:
1. A light emitting device comprising: a first semiconductor layer having a first and second surfaces, the first and second surfaces being opposite surfaces, the first semiconductor layer having a plurality of semiconductor columns extending from the second surface, the plurality of semiconductor columns being separated from each other; a light emitting structure formed over the first semiconductor layer, the light emitting structure including a first conductive semiconductor layer, an active layer and a second semiconductor layer, the light emitting structure having a side surface and an exposed side surface of a semiconductor column closest to the side surface of the light emitting structure being non-aligned with the side surface of the light emitting structure; and a substrate disposed under the plurality of semiconductor columns, wherein air gaps are provided between spacings of the columns; and wherein the second surface of the first semiconductor layer and the top surface of the substrate are uneven surfaces comprising jagged surfaces.