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Ambient spectrum light conversion device

  • US 9,295,855 B2
  • Filed: 03/17/2014
  • Issued: 03/29/2016
  • Est. Priority Date: 03/15/2013
  • Status: Active Grant
First Claim
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1. A high quantum yield (QY) photoluminescent light spectrum conversion device for absorbing and converting sunlight or other available ambient light to a modified light spectrum output that contains 75% or more of its output radiant light spectrum in the over-580 nm red, near-infrared and/or infrared wavelength range, the device comprising two or more photoluminescent conversion materials that collectively absorb over 60% of normal angle ambient light that has entered the device in the 350 nm to 580 nm spectral range, and wherein the modified light spectrum output light emitted from within the device provides 75% or more of its output radiant light power in the 580 nm-850 nm spectral range, wherein the photoluminescent conversion materials are selected from the group consisting of dyes, phosphors, quantum dots, and photonic structures, wherein the device comprises one or more layers that are transmissive of at least 40% of normal angle ambient light in a spectral range of over 600 nm that has entered the device, and wherein the device does not utilize any electrical power supply for the production of the modified light spectrum output, the device further comprising an optical filter that is over 50% transmissive to normal angle ambient light in most of the red or near infrared spectral range that has entered the device, so that ambient red and near-IR light is added to the spectrum converted light and constitutes a portion of the output radiant light spectrum to the targeted surfaces.

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