Light emitting device, light emitting device package, and lighting system

摘要

Provided are a light emitting device, a light emitting device package, and a lighting system. The light emitting device comprises a light emitting structure layer comprising a first conductive type semiconductor layer, a second conductive type semiconductor layer, and an active layer between the first conductive type semiconductor layer and the second conductive type semiconductor layer, and an electrode comprising a pad part and a branch part on the light emitting structure layer. The pad part comprises a conductive layer in which at least one opening is defined, and the branch part comprises a conductive layer electrically connected to the pad part and linearly extending from the pad part.