Patent ID: 8604488

Claim:
A light emitting diode (LED), comprising: a gallium nitride (GaN) substrate comprising a first surface and a second surface respectively disposed on two sides of the GaN substrate, the second surface has a plurality of protuberances, a height of the protuberances is h μm, and a distribution density of the protuberances on the second surface is d cm −2 , wherein h 2 d≧9.87×10 7 , and h≦1.8; a first type semiconductor layer disposed on the first surface of the GaN substrate; a light emitting layer disposed on a partial region of the first semiconductor layer, and a wavelength of a light emitted by the light emitting layer is from 375 nm to 415 nm; a second type semiconductor layer disposed on the light emitting layer; and a first electrode and a second electrode, wherein the first electrode is disposed on a partial region of the first type semiconductor layer, and the second electrode is disposed on a partial region of the second type semiconductor layer.