Patent ID: 9553233
Date: 2017-01-24
CPC Classifications: H01L

Claim:
1. A light emitting diode, comprising: a substrate; a first semiconductor layer; an active layer; a second semiconductor layer; a first electrode electrically connected to the first semiconductor layer; and a second electrode electrically connected to the second semiconductor layer, wherein the first semiconductor layer, the active layer, and the second semiconductor layer are stacked in that order on the substrate; and wherein the first semiconductor layer comprises a first surface and a second surface opposite to the first surface, the active layer is attached on the second surface, the substrate has a plurality of three-dimensional nano-structures, the plurality of three-dimensional nano-structures are adjoined to the first surface, and each of the plurality of three-dimensional nano-structures has a stepped structure; the plurality of three-dimensional nano-structures are defined in the substrate, and each of the plurality of three-dimensional nano-structures is hollow and comprises two interlinked spaces, and a stepped configuration is formed where the two interlinked spaces are joined with each other; and each of the plurality of three-dimensional nano-structures comprises a first cylindrical space and a second cylindrical space aligned with the first cylindrical space and adjacent to the first semiconductor layer.