Patent ID: 8212265

Claim:
A light emitting device, comprising a light emitting structure that includes a first conductive semiconductor layer, and active layer and a second conductive semiconductor layer: wherein the active layer is provided between the first conductive semiconductor layer and the second conductive semiconductor layer, and includes a plurality of well layers and at least one barrier layer; wherein the barrier layer includes a first nitride layer and a second nitride layer provided on the first nitride layer; wherein the first nitride layer has a larger energy band gap than the second nitride layer while the energy band gap of the second nitride layer is larger than that of each well layer, wherein the first nitride layer comprises In x1 Al y1 Ga (1-x1-y1) N, the second nitride layer comprises In x2 Al y2 Ga (1-x2-y2) N, and the well layer comprises In x3 Al y3 Ga (1-x3-y3) N, and In and Al compositions are defined by a first condition having x3=x2=x1 and y3<y2<y1, a second condition having x3>x2>x1 and y3=y2=y1, or a third condition having x3>x2>x1 and y3<y2<y1.