Patent ID: 8154008

Claim:
A light emitting diode (LED), comprising non-polar GaN-based semiconductor layers grown on a non-polar substrate, wherein the non-polar GaN-based semiconductor layers comprise: a non-polar N-type semiconductor layer; a non-polar P-type semiconductor layer; and non-polar active region layers positioned between the non-polar N-type semiconductor layer and the non-polar P-type semiconductor layer, the non-polar active region layers comprising a well layer and a barrier layer, wherein the barrier layer comprises a superlattice structure, wherein the well layer comprises In x Ga (1-x) N, and the barrier layer comprises a lower superlattice having In y Ga (1-y) N and GaN alternately laminated, an upper superlattice having In y Ga (1-y) N and GaN alternately laminated, and a middle superlattice interposed between the lower superlattice and the upper superlattice, the middle superlattice having In z Ga (1-z) N and GaN alternately laminated where 0<x<1, 0<y<0.05, 0<z<0.1 and y<z<x.