Patent ID: 7193236

Claim:
A nitride based 3-5 group compound semiconductor light emitting device comprising: a substrate; a buffer layer formed above the substrate; a first In-doped GaN layer formed above the buffer layer; an In x Ga 1−x N/In y Ga 1−y N super lattice structure layer formed above the first In-doped GaN layer; a first electrode contact layer formed above the In x Ga 1−x N/In y Ga 1−y N super lattice structure layer, the first electrode contact layer comprising a Si/In-codoped GaN layer; an active layer formed above the first electrode contact layer and functioning to emit light; a second In-doped GaN layer; a GaN layer formed above the second In-doped GaN layer; and a second electrode contact layer formed above the GaN layer; wherein the active layer comprises a single or multiple quantum well structure, including a low mole In-doped In x Ga 1−x N layer, and In y Ga 1−y N well layer and an In z Ga 1−z N barrier layer, and the low mole In-doped In x Ga 1−x N layer has an In content smaller than that of the In z Ga 1−z N barrier layer.