Patent · US Active

Photoactive taggant materials comprising semiconductor nanoparticles and lanthanide ions

US7919018B2 · kind B2 · utility

8Cited by
1References
6Claims
0Family size

Assignee

Inventors

Key dates

Filing dateOct 30, 2008
Grant dateApr 5, 2011
Priority date—
Expiry dateFeb 4, 2029

Classification

  • Technology area (CPC C)Chemistry; Metallurgy
  • CPC primaryC09D11/38
  • WIPO fieldBasic materials chemistry
  • WIPO sectorChemistry

Abstract

This invention provides, in one aspect, a procedure to use optically transparent nanocrystalline quantum dots to absorb UV light. This absorption process leads to an energy transfer to a chemically bound and chelated lanthanide ion that may emit light in either the visible spectrum (400-700 nm) or in the near infrared (700-1600 nm). This invention also provides methods for the use of these taggant materials in inks and aerosols used to disperse the taggant.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.