A light emitting device including a bonding layer; a barrier layer on the bonding layer; an adhesion layer on the barrier layer, in which the adhesion layer includes Pd, Au, and Sn; a reflective layer on the adhesion layer, in which the reflective layer includes Ag; an ohmic contact layer on the reflective layer, in which the ohmic contact layer includes Pt and Ag; a light emitting structure layer on the ohmic contact layer; and a passivation layer includes an insulating material on a side surface and a top surface of the light emitting structure layer.