Patent ID: 8829486

Claim:
A light-emitting device, comprising: a substrate; a first conductivity type semiconductor layer on the substrate; a light-emitting structure on the first conductivity type semiconductor layer, comprising: a plurality of first active layers, each of first active layers having a quantum well structure and emitting a light with a first light-emitting wavelength; and a plurality of second active layers, each of second active layers having a quantum well structure and emitting a light with a second light-emitting wavelength; and a second conductivity type semiconductor layer on the light-emitting structure, wherein the first active layers and the second active layers are stacked alternately, and wherein the first light-emitting wavelength is larger than the second light-emitting wavelength wherein the first active layer is a single layer, and the second active layer comprises multiple layers, and wherein the first light-emitting wavelength is the same for each of the first active layers and the second light-emitting wavelength is the same for each of the second active layers.