A light-emitting device includes a light emitting structure comprising a lower layer of the first conductivity type, an active layer, an upper layer of the second conductivity type, a first electrode connected to the lower layer of the first conductivity type, a second electrode connected to the upper layer of the second conductivity type, and an optical member seeded in the light emitting structure. The optical member can include a plurality of particles substantially transparent and having a lower refractive index than the light emitting structure. A plurality of discontinuities are formed at the boundary of the optical member in the light emitting structure.