Patent ID: 8610107

Claim:
A light emitting device having an active layer having a barrier structure of different quantum-barrier structures comprising: a first conductive type semiconductor layer; a second conductive type semiconductor layer on the first conductive type semiconductor layer; the 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, the second barrier layer having a third band gap; and at least one third barrier layer having the first band gap between the second barrier layer and the first conductive type semiconductor layer, 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 second band gap; and a second well layer between the second barrier layer and the at least one third barrier layer, wherein the second barrier layer is disposed between the first well layer and the second well layer, and the third band gap is narrower than the first band gape and the third band gap is wider than the second band gap.