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Quantum dot security inks

  • US 9,382,432 B1
  • Filed: 09/21/2015
  • Issued: 07/05/2016
  • Est. Priority Date: 09/21/2015
  • Status: Active Grant
First Claim
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1. A security ink, comprising:

  • a liquid medium; and

    a plurality of quantum dots disposed in said medium which, upon excitation with a light source, exhibit a quantum yield greater than 30%, and a photoluminescence which has at least one lifetime of more than 40 nanoseconds but less than 1 millisecond and which varies by at least 5% across the emission spectrum of the quantum dots.

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