Security feature
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United States of America Patent
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Aug 9, 2016
Grant Date -
May 2, 2013
app pub date -
Dec 23, 2010
filing date -
Jul 9, 2010
priority date (Note) -
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status (Latency Note)
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Abstract
The invention relates to a security feature with a luminescent pigment which has a host lattice doped with a luminophore and which is optically excitable to emit luminescent light. The luminescent light of the luminescent pigment has a luminescence spectrum with a first luminescence peak and a second luminescence peak whose peak intensities respectively depend on an amount fraction x of the luminophore in the luminescent pigment. In the luminescent pigment according to the invention, the host lattice and the luminophore and the amount fraction x of the luminophore are chosen such that even a slight increase or reduction of the amount fraction x of the luminophore causes a strong relative change of the peak intensities IA and IB. This increases the forgery-proofness of the luminescent pigment according to the invention.
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