Patent ID: 8237181

Claim:
A semiconductor light emitting device, comprising: a first conductive type semiconductor layer; an active layer formed on the first conductive type semiconductor layer; a second conductive type semiconductor layer including a first semiconductor layer formed on the active layer and a second semiconductor layer formed on the first semiconductor layer; a third semiconductor layer formed between the first semiconductor layer and the second semiconductor layer; and a fourth semiconductor layer formed between the first semiconductor layer and the active layer, wherein the third semiconductor layer has a P-type dopant concentration less than a P-type dopant concentration of the second semiconductor layer and the fourth semiconductor layer has a P-type dopant concentration less than a P-type dopant concentration of the first semiconductor layer, wherein the third semiconductor layer has a hole concentration of about 5×10 18 /cm 3 or less and has a thickness of greater than 0 nm and less than or equal to about 9 nm.