Patent ID: 8390006

Claim:
A light emitting device, comprising: a reflective layer comprising a first GaN-based semiconductor layer having a first refractive index, a second GaN-based semiconductor layer having a second refractive index less than the first refractive index, and a third GaN-based semiconductor layer having a third refractive index less than the second refractive index; and a light emitting structure layer comprising a first conductive type semiconductor layer, a second conductive type semiconductor layer, and an active layer disposed between the first conductive type semiconductor layer and the second conductive type semiconductor layer on the reflective layer, wherein the first GaN-based semiconductor layer and the second GaN-based semiconductor layer are alternately stacked in a vertical direction in a first region of the reflective layer, and the second GaN-based semiconductor layer and the third GaN-based semiconductor layer are alternately stacked in the vertical direction in a second region of the reflective layer, wherein the reflective layer comprises a plurality of layers including at least two layers from the first GaN-based semiconductor layer, the second GaN-based semiconductor layer and the third GaN-based semiconductor layer, and wherein at least two of the first GaN-based semiconductor layer, the second GaN-based semiconductor layer, and the third GaN-based semiconductor layer are alternately disposed in a horizontal direction perpendicular to the vertical direction.