A light emitting device includes an n-type cladding layer. a p-type cladding layer. an active layer interposed between the n-type cladding layer and the p-type cladding layer and an ohmic contact layer contacting the p-type cladding layer or the n-type cladding layer. The ohmic contact layer includes a first film that includes a transparent conductive zinc oxide doped with a rare earth metal and including a one-dimensional nano structure. The one-dimensional nano structure is one of a nano-column, a nano rod and a nano wire.