Light emitting device, light emitting device package and illumination system

摘要

A light emitting device is provided. The light emitting device includes a first conductive type semiconductor layer (130), an active layer (140) including a plurality of well layers and a plurality of barrier layers on the first conductive type semiconductor layer, and a second conductive type semiconductor layer (150) on the active layer. An upper surface of at least first barrier layer among the barrier layers includes an uneven surface (140A) . The first barrier layer is disposed more closely to the second conductive type semiconductor layer than to the first conductive type semiconductor layer.