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Composite high reflectivity layer

  • US 7,915,629 B2
  • Filed: 12/08/2008
  • Issued: 03/29/2011
  • Est. Priority Date: 12/08/2008
  • Status: Active Grant
First Claim
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1. A light emitting diode (LED) chip, comprising:

  • an active region between two oppositely doped layers;

    a composite high reflectivity layer arranged to reflect light emitted from said active region, said composite layer comprising;

    a first layer;

    one or more second layers and a plurality of third layers on said first layer, said second layers having an index of refraction different from said third layers, said second and third layers alternating, and each of said third layers having different thicknesses compared to the other of said third layers, said third layers comprising at least a pair of layers comprising a same material and different thicknesses; and

    a reflective layer on the topmost of said second and third layers.

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