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Illumination Apparatus with High Conversion Efficiency and Methods of Forming the Same

  • US 20130063964A1
  • Filed: 12/27/2010
  • Published: 03/14/2013
  • Est. Priority Date: 05/12/2010
  • Status: Abandoned Application
First Claim
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1. An illumination apparatus comprising:

  • a substantially planar waveguide having (i) a discrete in-coupling region for receiving light and (ii) a discrete out-coupling region for emitting light, the out-coupling region comprising at least a portion of at least one surface of the waveguide substantially perpendicular to a direction of light propagation in the waveguide;

    at least one light source for emitting light into the in-coupling region;

    a layer of photoluminescent material, disposed over the out-coupling region, for converting a portion of light emitted from the out-coupling region to a different wavelength; and

    an optically active layer, disposed between the out-coupling region and the layer of photoluminescent material, for separating light interacting with the photoluminescent material from light propagating within the waveguide,wherein light emitted by the light source mixes with light converted by the photoluminescent material to form substantially white output light.

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