Patent ID: 8987025
Filing Date: 2015-03-24
Classification: H01L

Abstract:
1. A manufacturing method for an LED (light emitting diode) comprising following steps: providing a substrate; disposing a transitional layer on the substrate, the transitional layer comprising a planar area with a flat top surface and a patterned area with a rugged top surface, wherein the patterned area and the planar area are arranged alternately, the patterned area comprising a plurality of protrusions, and a groove being defined between every two adjacent protrusions; coating an aluminum layer on the transitional layer; using a nitriding process on the aluminum layer to form an AlN material on the transitional layer, the AlN material having first part located on the planar area and the patterned area and second part located in the patterned area, the first part consisting of the a plurality of separated masses each being spherical, pyramid or cylindrical, the second part consisting of a plurality of slugs; disposing an epitaxial layer on the transitional layer and covering the AlN material, the epitaxial layer contacting the planar area and the patterned area of the transitional layer, a plurality of gaps being defined between the epitaxial layer and the slugs of the second part of the AlN material in the patterned area of the transitional layer.