Patent ID: 8829490

Claim:
A semiconductor light emitting device, comprising: a first conductive semiconductor layer; an active layer disposed on the first conductive semiconductor layer; a second conductive semiconductor layer disposed between the first conductive semiconductor layer and the active layer; a third conductive semiconductor layer disposed between the active layer and the second conductive semiconductor layer; a fourth conductive semiconductor layer on the active layer; a fifth conductive semiconductor layer disposed between the fourth conductive semiconductor layer and the active layer; a first electrode layer electrically connected to at least one of the first to third conductive semiconductor layers; and a second electrode layer electrically connected to the fifth conductive semiconductor layer, wherein the first to third conductive semiconductor layers include an n-type dopant, wherein the fourth and fifth conductive semiconductor layers include a p-type dopant, wherein the first and third conductive semiconductor layers are formed of a GaN semiconductor, wherein the second conductive semiconductor layer is formed of an InGaN-based semiconductor and is formed of a different semiconductor from the first and third conductive semiconductor layers, wherein the fourth conductive semiconductor layer is formed of an AlGaN semiconductor, wherein the fifth conductive semiconductor layer is formed of a GaN-based semiconductor, wherein the first conductive semiconductor layer has a thickness thicker than a thickness of the third conductive semiconductor layer, wherein the fifth conductive semiconductor layer has a thickness thicker than a thickness of the fourth conductive semiconductor layer, wherein the active layer includes plurality of quantum barrier layers and plurality of quantum well layers, wherein a cycle of the quantum barrier layer and the quantum well layer of the active layer includes a cycle of 2 to 10, wherein the plurality of quantum well layers include an InGaN semiconductor layer, wherein at least one of the plurality of quantum barrier layers includes a GaN-based semiconductor layer, and wherein at least two of the plurality barrier layers has a thickness of about 50 Å to about 300 Å, respectively.