06686074 is referenced by 11 patents and cites 1 patents.

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 thulium, wherein the wavelength of the absorbed electromagnetic radiation is shorter than the wavelength of the emitted 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.

Title
Secured documents identified with anti-stokes fluorescent compositions
Application Number
10/101520
Publication Number
6686074 (B2)
Application Date
March 18, 2002
Publication Date
February 3, 2004
Inventor
Hans Zerbel
Berlin
US
Arnim Franz Burholz
Falkensee
US
Benedikt Ahlers
Berlin
US
Manfred Paeschke
Basdorf
US
Gabriele Brauer
Berlin
US
Anett Bailleu
Berlin
US
Wolfgang Schmidt
Berlin
US
Helge Brockmann
Boll
US
Oliver Muth
Berlin
US
Agent
Darby & Darby
US
Assignee
Bundesdruckerei
US
IPC
B41M 3/12
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