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Quantum dot films, lighting devices, and lighting methods

  • US 10,444,423 B2
  • Filed: 02/03/2015
  • Issued: 10/15/2019
  • Est. Priority Date: 12/30/2008
  • Status: Active Grant
First Claim
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1. A quantum dot (QD) phosphor film, comprising:

  • a QD phosphor material comprising at least one population of QDs embedded in at least one matrix material, wherein the QDs emit secondary light upon absorbance of primary light;

    at least one bottom barrier film disposed on a first surface of the QD phosphor material;

    at least one top barrier film disposed on a second surface of the QD phosphor material, wherein the second surface is opposite the first surface, and wherein the at least one top barrier film comprises a brightness enhancing film configured to reflect a portion of the primary light towards the QD phosphor material, such that the portion of the primary light has an increased optical path length within the QD phosphor material to cause increased primary light absorption by the QDs and thereby increase emission of secondary light; and

    wherein the QD phosphor material is disposed between the at least one top barrier film and the at least one bottom barrier film.

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