Patent ID: 8174040

Claim:
A light emitting device, comprising: a reflective layer; an ohmic contact layer on the reflective layer; a p-type semiconductor layer on the ohmic contact layer; an active layer on the p-type semiconductor layer; and an n-type semiconductor layer on the active layer, wherein a distance “d” between the reflective layer and a light emitting portion of the active layer is set to the following equation: d=(2m+1)/4×(λ/n)±α, where m is an integer equal to or greater than 0, λ is a wavelength of light emitted by the active layer, n is an average refractive index of a medium including the p-type semiconductor layer and the ohmic contact layer between the active layer and the reflective layer, and α is a fluctuation range according to types of the reflective layer where α (⅛)×(λ/n), and wherein the ohmic contact layer comprises: a lower transparent conductive oxide layer on the reflective layer; an intermediate dielectric layer on the lower transparent conductive oxide layer; and an upper transparent conductive oxide layer on the intermediate layer.