Anti-stokes fluorescent compositions and methods of use

US6841092B2 · kind B2 · utility

Assignees

• BUNDESDRUCKEREI GMBH · DE
• Fa. Leuchtstoffwerk Breitungen GmbH · DE

Inventors

• Manfred Paeschke · Wandlitz, DE
• Benedikt Ahlers · Berlin, DE
• Anett Bailleu · Berlin, DE
• Oliver Muth · Berlin, DE
• Arnim Franz-Burgholtz · Falkensee, DE
• Wolfgang Schmidt · Frankfurt, DE
• Detlef Starick · Berlin, DE
• Wolfgang Kempfert · Bad Liebenstein, DE

Key dates

• Filing date: Mar 18, 2002
• Grant date: Jan 11, 2005
• Expiry date: Mar 18, 2022

Classification

• Technology area (CPC G): Physics
• CPC primary: G07D7/205
• WIPO field: Control
• WIPO sector: Instruments

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.