Patent ID: 8890114

Claim:
A light-emitting device, comprising: a first semiconductor layer; a second semiconductor layer; an active layer formed between the first semiconductor layer and the second semiconductor layer; a first electron blocking layer for reducing electron overflow from the active layer to the first semiconductor layer, interposed between the first semiconductor layer and the active layer; and a second electron blocking layer for reducing electron overflow from the active layer to the second semiconductor layer, interposed between the second semiconductor layer and the active layer, wherein the thickness of the second electron blocking layer is not equal to that of the first electron blocking layer, and/or the band gap energy of the second electron blocking layer is not equal to that of the first electron blocking layer, wherein the material of the first electron blocking layer and/or the second electron blocking layer comprises Al x Ga y In 1-x-y N, 0≦x≦1, 0≦y≦1, and the Al composition of the first electron blocking layer is lower than 25%, and/or the Al composition of the second electron blocking layer is lower than 25%.