Patent ID: 9029875
Filing Date: 2015-05-12
Classification: H01L

Abstract:
1. A light emitting device comprising: a first conductive semiconductor layer; an active layer comprising a well layer and a barrier layer on the first conductive semiconductor layer; and a second conductive semiconductor layer on the active layer, wherein the well layer comprises: a first well layer adjacent to the first conductive semiconductor layer and having a first energy bandgap; a third well layer adjacent to the second conductive semiconductor layer and having a third energy bandgap; and a second well layer interposed between the first well layer and the third well layer and having a second energy bandgap, wherein the first conductive semiconductor layer is an n-type semiconductor layer, and the second conductive semiconductor layer is a p-type semiconductor layer, wherein the third well layer is disposed closest to the p-type semiconductor layer, wherein the third energy bandgap of the third well layer is greater than the second energy bandgap of the second well layer and the first energy bandgap of the first well layer, wherein a thickness of the third well layer is greater than both a thickness of the first well layer and a thickness of the second well layer, and wherein the second energy bandgap of the second well layer is same with the first energy bandgap of the first well layer.