Patent ID: 8823047
Filing Date: 2014-09-02
Classification: H01L

Abstract:
1. A semiconductor light emitting device, comprising: a first conductive type clad layer comprising a first clad layer comprising at least a first layer, a second layer on the first layer, and a third layer on the second layer, wherein the first clad layer has an aluminum composition ratio which is increased by a step graded increment in an order from the first layer of the first clad layer to an uppermost layer of the first clad layer, and wherein the first clad layer is a step graded layer; an active layer on the first conductive type clad layer; and a second conductive type semiconductor layer on the active layer; wherein the first conductive type clad layer comprises a second clad layer which is provided between the first clad layer and the active layer, wherein the second clad layer has an aluminum composition ratio, wherein the aluminum composition ratio of the second clad layer is approximately equal to an aluminum composition ratio of the uppermost layer of the first clad layer, and wherein the second clad layer is thicker than the first clad layer.