Patent ID: 8269238

Claim:
A photonic crystal light emitting device comprising: a light emitting diode (LED) light emitting structure including a first conductive semiconductor layer, a second conductive semiconductor layer, and an active layer interposed between the first and second conductive semiconductor layers; a first photon-recycling light emitting layer formed on one surface of the first conductive semiconductor layer, opposite to an interface between the first conductive semiconductor layer and the active layer; and a transparent substrate disposed between the first photon-recycling light emitting layer and the first conductive semiconductor layer, wherein the first photon-recycling light emitting layer has a photonic crystal structure, which absorbs a primary light emitted from the LED light emitting structure and emits a light having a different wavelength from a wavelength of the primary light, wherein the photonic crystal structure includes a periodic pattern of semiconductor posts extending across an entire thickness of the first photon-recycling light emitting layer from a top surface of the first photon-recycling light emitting layer to a bottom surface of the first photon-recycling light emitting layer, the photonic crystal structure is comprised of an AlGalnP semiconductor, and the light emitted by the photonic crystal structure of the AlGalnP semiconductor and having the different wavelength from the wavelength of the primary light is yellow.