Patent ID: 8124990

Claim:
A semiconductor light emitting device, comprising: a first conductive type semiconductor layer; an active layer comprising a first active layer, a second active layer, and an electron barrier layer, the active layer being formed on the first conductive type semiconductor layer, wherein the first active layer and the second active layer each comprises a quantum well layer and a quantum barrier layer, and wherein the electron barrier layer is between the first active layer and the second active layer; and a second conductive type semiconductor layer on the active layer, wherein the electron barrier layer and at least one of the quantum well layers of the active layer are in contact with each other, wherein the first and second active layers each comprises a cycle of the quantum well layer and the quantum barrier layer, wherein the electron barrier layer comprises an AlGaN based semiconductor layer, wherein an energy band gap of the electron barrier layer is greater than an energy band gap of a quantum barrier layer of the first active layer or an energy band gap of a quantum barrier layer of the second active layer, and wherein the electron barrier layer is physically contacted with the quantum well layer of the first active layer and the quantum well layer of the second active layer.