A light emitting diode includes a second electrode, a first semiconductor layer, an active layer, a second semiconductor layer, a reflector, and a first electrode. The second electrode, the first semiconductor layer, the active layer, the second semiconductor layer, and the reflector are stacked on the first electrode in that order. The first semiconductor layer defines a plurality of grooves on a surface contacting the second electrode. The plurality of grooves form a patterned surface used as the light extraction surface. A carbon nanotube layer is located on the patterned surface and embedded into the grooves.