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Light emitting system with high extraction efficency

  • US 7,250,635 B2
  • Filed: 02/06/2004
  • Issued: 07/31/2007
  • Est. Priority Date: 02/06/2004
  • Status: Active Grant
First Claim
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1. A solid state light emitting diode device comprising:

  • an active layer emitting incoherent light in response to current injected into the layer;

    a first structure comprising at least one waveguide layer adjacent to the active layer and two cladding layers wherein said active layer and said at least one waveguide layer are located between the two cladding layers, wherein an index of refraction of said at least one waveguide layer is higher than that of the cladding layers, said structure trapping the incoherent light generated by the active layer; and

    a second structure comprising a photonic crystal structure adjacent to the first structure extracting the incoherent light that is trapped by the first structure and outputting incoherent light.

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