A light emitting diode (LED) includes a substrate, a first type epitaxial layer, a light emitting layer, a second type epitaxial layer and a plurality of nano-particles. The first type epitaxial layer is disposed on the substrate. The light emitting layer is disposed on the first type epitaxial layer. The second type epitaxial layer is disposed on the light emitting layer and has one surface formed with a plurality of recesses and a plurality of protrusions. The nano-particles are disposed on the protrusions of the second type epitaxial layer.