LIGHT-EMITTING DIODE CHIP WITH HIGH EXTRACTION AND METHOD FOR MANUFACTURING THE SAME

摘要

This invention provides a light-emitting diode chip with high light extraction, which includes a substrate, an epitaxial-layer structure for generating light by electric-optical effect, a transparent reflective layer sandwiched between the substrate and the epitaxial-layer structure, and a pair of electrodes for providing power supply to the epitaxial-layer structure. A bottom surface and top surface of the epitaxial-layer structure are roughened to have a roughness not less than 100nm root mean square (rms). The light generated by the epitaxial-layer structure is hence effectively extracted out. A transparent reflective layer not more than 5μm rms is formed as an interface between the substrate and the epitaxial-layer structure. The light toward the substrate is more effectively reflected upward. The light extraction and brightness are thus enhanced. Methods for manufacturing the light-emitting diode chip of the present invention are also provided.