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Photolytically and environmentally stable multilayer structure for high efficiency electromagnetic energy conversion and sustained secondary emission

  • US 8,232,533 B2
  • Filed: 11/08/2011
  • Issued: 07/31/2012
  • Est. Priority Date: 09/30/2010
  • Status: Active Grant
First Claim
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1. A multilayer structure for authentication, said multilayer structure comprising:

  • an energy conversion layer that converts energy of a primary electromagnetic radiation to a longer output wavelength, said energy conversion layer comprising;

    a polymer and a first photoluminescent material with a first radiation absorption spectrum that at least partially overlaps with the primary electromagnetic radiation;

    at least one stability enhancement layer that increases the photolytic and thermal stability of said multilayer structure; and

    at least one blocking layer that prevents at least a portion of said energy conversion layer from converting energy of the primary electromagnetic radiation to the longer output wavelength.

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