Patent ID: 7615772

Claim:
A nitride semiconductor LED, comprising: a substrate; a buffer layer on the substrate, wherein the buffer layer has a triple-structured Al y In x Ga 1−(x+y) N/In x Ga 1−x N/GaN laminated (where 0≦x≦1, 0≦y≦1); Al y Ga 1−y N/GaN short period superlattice (SPS) layers on the buffer layer in a sandwich structure of upper and lower layers having an undoped GaN layer interposed therebetween (where 0<y≦1); a first GaN based layer on the upper Al y Ga 1−y N/GaN SPS layer; an n type GaN based layer on the first GaN based layer, wherein the n type GaN based layer comprises a semi-insulating GaN based layer and a low concentration of below 1×10 18 /cm 3 doped n-GaN layer; an active layer on the n type GaN based layer; and a second GaN based layer formed on the active layer.