Photoactive taggant materials comprising semiconductor...

Details Photoactive taggant materials comprising semiconductor... Photoactive taggant materials comprising semiconductor...

2011-04-05

2011-04-05

Choi, Ling-Siu (Department: 1761)

Compositions

Light transmission modifying compositions

Infrared

C252S582000, C252S588000, C436S172000, C436S537000, C065S060200, C065S060500, C065S099200

Reexamination Certificate

active

07919018

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.

REFERENCES:
patent: 7096692 (2006-08-01), Greenberg et al.
patent: 2008/0107606 (2008-05-01), Grotjahn et al.
patent: 2008/0194044 (2008-08-01), Faris et al.

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