Patent ID: 7858999

Claim:
A light-emitting chip device with high thermal conductivity, comprising: an epitaxial chip including a substrate and an epitaxial-layer structure capable of generating light by electro-optical effect on said substrate, said epitaxial-layer structure including a first cladding layer of first conductivity type having a bottom surface with a roughness not less than 100 nm rms corresponding to said substrate, a second cladding layer of second conductivity type opposite to said first conductivity type having a top surface with a roughness not less than 100 nm rms, and an active layer sandwiched between said first cladding layer and said second cladding layer; an electrode disposed on and in ohmic contact with said top surface of said second cladding layer; and a U-shaped electrode base under said epitaxial chip and surrounding said substrate and said first cladding layer, such that said U-shaped electrode base covers and connects to at least a portion of a bottom surface of the substrate, said U-shaped electrode being in ohmic contact with said first cladding layer and in contact with said electrode to provide electric energy to said epitaxial chip.