Patent ID: 8476671
Filing Date: 2013-07-02
Classification: H01L

Abstract:
1. A light emitting device comprising: a support; a light emitting structure coupled to the support, the light emitting structure including a first conductive type semiconductor layer, a second conductive type semiconductor layer, and an active layer between the second conductive type semiconductor layer and the first conductive type semiconductor layer; a first nitride semiconductor layer coupled to the second conductive type semiconductor layer; a second nitride semiconductor layer coupled to the first nitride semiconductor layer and including an uneven surface; and a first electrode pad coupled to the light emitting structure, wherein: the second nitride semiconductor layer has an opening that exposes a portion of the first nitride semiconductor layer, the first electrode pad is directly coupled to the exposed portion of the first nitride semiconductor layer through the opening and is spaced from the second nitride semiconductor layer, and the exposed portion of the first nitride semiconductor layer directly coupled to the first electrode pad has a work function smaller than that of the second nitride semiconductor layer that is spaced from the first electrode, wherein at least one of the first nitride semiconductor layer or the second nitride semiconductor layer has a composition that includes indium, and wherein an indium content of the exposed portion of the first nitride semiconductor layer is greater than an indium content of the second nitride semiconductor layer.