Patent ID: 8624221

Claim:
A light emitting device comprising: a first conductive type semiconductor layer; a second conductive type semiconductor layer on the first conductive type semiconductor layer; and an active layer between the first conductive type semiconductor layer and the second conductive type semiconductor layer, the active layer comprising a plurality of well layers and a plurality of barrier layers, wherein the plurality of barrier layers comprise: a first barrier layer that is the nearest to the second conductive type semiconductor layer, the first barrier layer having a first band gap; a second barrier layer adjacent to the first barrier layer; and at least one third barrier layer between the second barrier layer and the first conductive type semiconductor layer, wherein the plurality of well layers comprise: a first well layer between the first barrier layer and the second barrier layer, the first well layer having a third band gap; and a second well layer between the second barrier layer and the at least one third barrier layer, the second well layer having a second band gap, the first well layer has a thickness thinner than that of the second well layer; and the third band gap is different from the first band gap, wherein the second conductive type semiconductor layer includes a different conductive type dopant from the first conductive type semiconductor layer.