Light emitting diode structure

摘要

An LED structure includes a substrate, an emitting multilayer structure, a plurality of microstructures and a transparent conductive layer. The emitting multilayer structure is formed on the substrate. The microstructures are spaced apart from each other on the light emitting multilayer structure, and an upper surface of each microstructure has a concave-convex surface. The transparent conductive layer is conformably covered over the light emitting multilayer structure and the microstructures. The transparent conductive layer has similar concave-convex surfaces due to the concave-convex surface of each microstructure. The light emitted from the emitting multilayer structure is changed due to the concave-convex surface of the transparent conductive layer, so that the phenomenon of total internal reflection can be reduced so as to increase the light transmittance.

主权项

1. An LED structure comprising:
a substrate; an emitting multilayer structure disposed on the substrate; a plurality of microstructures spaced apart from each other on the emitting multilayer structure, and each microstructure comprising a first concave-convex surface, wherein the first concave-convex surface has a surface roughness ranging from 0.1 nm to 1.1 nm; a transparent conductive layer conformably formed on a first overall upper surface of the emitting multilayer structure and the microstructures so as to form a second overall upper surface with a plurality of second concave-convex surfaces, each second concave-convex surface is aligned with a corresponding one of the first concave-convex surfaces; and a first type electrode formed on the transparent conductive layer, wherein a bottom surface of the microstructure is getting larger when being closer to the first type electrode.