A light emitting diode includes a substrate, a first semiconductor layer, an active layer, a second semiconductor layer, a first electrode, and a second electrode. The first semiconductor layer, the active layer, and the second semiconductor layer are orderly stacked on the substrate. The second semiconductor layer is covered with stepped three-dimensional nano-structures in a particular shape, which act to reabsorb wide-angle incident light and re-emit the light at narrower angles of incidence, to increase the light-giving properties of the light emitting diode.