Patent ID: 8304785

Claim:
A light emitting diode (LED) structure comprises: a composite substrate comprising a first silicon substrate, a second silicon substrate, an insulation layer and a semiconductor region, wherein the first silicon substrate covers an upper surface of the insulation layer, the insulation layer is disposed between the first silicon substrate and the second silicon substrate, the semiconductor region is embedded within the first silicon substrate, the first silicon substrate and the semiconductor region together form a diode structure, wherein the first silicon substrate is one of a P-type semiconductor region and an N-type semiconductor region of the diode structure, the semiconductor region is another of the P-type semiconductor region and the N-type semiconductor region of the diode structure, and the P-type semiconductor region or the N-type semiconductor region has a predetermined doping concentration, the diode structure is a temperature sensor, and the sensitivity of the temperature sensor is based on the predetermined doping concentration; and an LED disposed on the composite substrate; wherein, the diode structure is used for sensing a heat emitted from the LED.