A light-emitting device includes a semiconductor stack including a first semiconductor layer, a second semiconductor layer, and an active layer emitting an UV light, formed between the first semiconductor layer and the second semiconductor layer; a first transparent conductive layer formed on the second semiconductor layer, the first transparent conductive layer including metal oxide; and a second transparent conductive layer formed on the first transparent conductive layer, the second transparent conductive layer including graphene, wherein the first transparent conductive layer is continuously formed over a top surface of the second semiconductor layer, the first transparent conductive layer comprises a thickness smaller than 10 nm.