Anti-stokes fluorescent compositions and methods of use

Details Anti-stokes fluorescent compositions and methods of use Anti-stokes fluorescent compositions and methods of use

2005-01-11

2005-01-11

Kopec, Mark (Department: 1751)

Compositions

Inorganic luminescent compositions

Compositions containing halogen; e.g., halides and oxyhalides

C359S002000, C283S092000

Reexamination Certificate

active

06841092

ABSTRACT:
The present invention provides a secured document including a composition capable of anti-Stokes fluorescence containing an ion capable of absorption of electromagnetic radiation, an ion capable of emitting electromagnetic radiation, and a matrix composition comprising gadolinium, yttrium, lanthanum, and lutetium, wherein the wavelength of the emitted electromagnetic radiation is shorter than the wavelength of the absorbed electromagnetic radiation, and wherein the concentrations of the absorbing and emitting ions are adjusted to achieve concentration quenching of anti-Stokes luminescence.

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Pawar et al “Luminescence of (yttrium, gadolinium and lanthanum)oxysulfide ((Y, Gd and La)202S) phosphors”, Indian Journal of Pure and Aplied Physics (1976), 14(2), 960-3 (Abstract Only).*
Blasse et al “The gadolinium (3+) luminescence of the solid solutions yttrium gadolinium oxide sulfide. . . ”, Chemical Physics Letters (1989), 164(6), 617-20 (Abstract Only).*
Kurochkin et al “Anti-Stokes luminescence of erbium, ytterbium-doped lanthanum oxysulfides. . . ”, Optika i Spektroskopiya (1992), 73(4), 741-8 (Abstract Only).

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