Light trapping optical structures employing light converting and light guiding layers

  • US 10,269,999 B2
  • Filed: 02/25/2017
  • Issued: 04/23/2019
  • Est. Priority Date: 07/13/2010
  • Status: Active Grant
First Claim
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1. A light converting optical system, comprising:

  • a monochromatic light source configured to emit light in a preselected spectral range;

    a plurality of linear cylindrical microlenses arranged into a planar lenticular lens array and longitudinally extending parallel to each other between opposing terminal edges of the lens array;

    a planar light guiding layer of an optically transmissive material optically coupled to the lens array and configured to guide light using optical transmission and a total internal reflection,wherein the lens array and the light guiding layer are positioned in energy receiving relationship with respect to the monochromatic light source;

    a plurality of light deflecting elements formed in a surface of the light guiding layer and disposed in energy receiving relationship with respect to the lens array, wherein the light deflecting elements are spaced apart from each other, and wherein the area of each of the plurality of light deflecting elements is substantially less than the area of each of the microlenses;

    a broad-area reflective surface spaced by a distance from the lens array and longitudinally and laterally extending parallel to the lens array;

    a generally planar photoresponsive layer located between the lens array and the broad-area reflective surface and being disposed in energy receiving relationship with respect to the lens array,wherein a light input surface of the photoresponsive layer facing the planar lens array is configured for a generally unimpeded light passage from the planar lens array to the body of the photoresponsive layer, wherein the photoresponsive layer comprises a plurality of quantum dots embedded into an optically transmissive material and is configured to absorb and convert light in the preselected spectral range, and wherein the photoresponsive layer is configured at a sufficiently low thickness to transmit at least a portion of incident light without absorption in a single pass, and wherein the broad-area reflective surface is configured to receive unabsorbed light exiting from the photoresponsive layer and direct the unabsorbed light back towards the photoresponsive layer.

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