Patent ID: 8441025

Claim:
A light emitting device, comprising: a reflective layer including a plurality of first projections; a patterned layer on an upper portion of the reflective layer, wherein the patterned layer is disposed between adjacent projections of the plurality of projections; and a light emitting layer formed on the reflective layer, the light emitting layer comprising: a first conductive type semiconductor layer provided on the patterned layer; an active layer provided on the first conductive type semiconductor layer; and a second conductive type semiconductor layer provided on the active layer, wherein the patterned layer includes a plurality of second projections respectively extending into spaces between the adjacent projections, the plurality of projections having at least one cross sectional shape having a prescribed thickness and width and being formed along the patterned layer at a prescribed periodicity of 0.75λ/n to 5λ/n, where λ is the wavelength of the light emitted from the light emitting layer, and n is the refractive index of the light emitting layer.