Patent ID: 8604503

Claim:
An LED (light emitting diode), comprising: a substrate; an epitaxial layer being disposed on the substrate; a transitional layer being formed between the substrate and the epitaxial layer, the transitional layer comprising a planar area with a flat top surface and a patterned area with a rugged top surface, the epitaxial layer contacting the planar area and the patterned area of the transitional layer; and an AlN (aluminum nitride) material being disposed between the epitaxial layer and the transitional layer, the AlN material comprising a first part formed on the planar area and the patterned area of the transitional layer and a second part in the patterned area of the transitional layer, the first part consisting of a plurality of masses separated from each other and the second part consisting of a plurality of slugs separated from each other and from the masses of the first part of the AlN material.