Patent ID: 6914268

Claim:
A light emitting diode (LED) device, comprising: a device substrate; a first doped layer, formed on the device substrate; a light emitting layer, formed on the first doped layer; a second doped layer, formed on the light emitting layer, wherein the second doped layer and the first doped layer are comprised of a semiconductor material of a III-V group compound with different conductivity type; a strained-layer superlattice contact layer a transparent conductive oxide layer as an ohmic contact layer, wherein the transparent conductive oxide layer is deposited on the strained-layer superlattice contact layer, wherein a thickness of the transparent conductive oxide layer is (2 m+1)λ/2 n (m is 0 or a positive integer), wherein λ is a wavelength of a light emitted from the light emitting layer and n is a refractive index of the transparent conductive oxide layer; a reflecting layer, deposited on the transparent conductive oxide layer; and two electrodes, formed on the reflecting layer and a portion of the first doped layer, respectively.