Patent ID: 9548424
Date: 2017-01-17
CPC Classifications: H01L

Claim:
1. A light emitting diode, comprising: a semiconductor stacked structure, comprising: a substrate, carrying the semiconductor stacked structure and facing the second semiconductor layer; a first electrode, disposed between the second semiconductor layer and the substrate and electrically connected to the second semiconductor layer and the substrate; a second electrode, disposed on the first semiconductor layer; and an outer light extraction layer, disposed on the first semiconductor layer, wherein the outer light extraction layer forms a roughened structure, and a light refractive index of the outer light extraction layer is less than a light refractive index of the first semiconductor layer, wherein the outer light extraction layer is a complete layer covering entirely a top surface of the first semiconductor layer, and the roughened structure comprises a plurality of micro lenses; and at least one inner light extraction layer, disposed between the outer light extraction layer and the first semiconductor layer, wherein a light refractive index of the outer light extraction layer is less than a light refractive index of the at least one inner light extraction layer.