Patent ID: 8487320

Claim:
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 orderly stacked on the substrate, the second semiconductor layer has a plurality of three-dimensional nano-structures, and each of the plurality of three-dimensional nano-structures has a stepped structure, wherein each of the plurality of three-dimensional nano-structures comprises a first cylinder located on the second semiconductor layer and a second cylinder located on the first cylinder, a diameter of the first cylinder is in a range from about 50 nanometers to about 200 nanometers, a height of the first cylinder is in a range from about 100 nanometers to about 500 nanometers, a diameter of the second cylinder is in a range from about 20 nanometers to about 200 nanometers, a height of the second cylinder is in a range from about 100 nanometers to about 300 nanometers, and a distance between two adjacent first cylinders is in a range from about 10 nanometers to about 30 nanometers.