Patent ID: 8143643

Claim:
A light emitting device, comprising: a first semiconductor layer; an active layer formed on the first semiconductor layer; a second semiconductor layer formed on the active layer; and an electrode formed on the second semiconductor layer, wherein the electrode comprises a fourth metal layer on the semiconductor layer, a first metal layer including at least one of Au, Ni, Ti and/or Pt formed on the fourth metal layer, a second metal layer including at least one of Ni, Pt, and/or Pd formed on the first metal layer, and a third metal layer including Au, and/or a compound of two or more materials containing Au, and formed to contact the second metal, wherein the electrode further comprises: a first diffusion barrier layer between the second semiconductor layer and the fourth metal layer and includes a compound material of the second semiconductor layer and a metal material of the fourth metal layer, and a second diffusion layer between the first metal layer and the second metal layer and includes a metal material of the first metal layer and a metal material of the second metal layer, and wherein the first to third metal layers are in contact with each other.