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Light-emitting devices with high light collimation

  • US 7,301,271 B2
  • Filed: 02/07/2005
  • Issued: 11/27/2007
  • Est. Priority Date: 04/15/2003
  • Status: Expired due to Term
First Claim
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1. A light-emitting diode comprising:

  • a multi-layer stack of materials including a light-generating region and a first layer supported by the light-generating region,wherein;

    the first layer comprises a semiconductor material and a surface of the first layer is configured so that light generated by the light generating region can emerge from the light-emitting diode via the surface of the first layer;

    the surface of the first layer has a dielectric function that varies spatially according to a pattern, wherein the pattern is defined, at least in part, by a plurality of non-concentric holes; and

    the pattern is configured so that light generated by the light-generating region that emerges from the light-emitting diode via the surface of the first layer is substantially incoherent and more collimated than a Lambertian distribution of light.

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