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Authenticity mark in the form of luminescent substances

A luminous substance, authenticity technology, applied in the inspection of the authenticity of banknotes, record carriers used by machines, processing coins or valuable banknotes, etc., can solve the problems of inefficient excitation and long life.

Active Publication Date: 2009-10-07
GIESECKE & DEVRIENT CURRENCY TECHNOLOGY GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Furthermore, their disadvantage is that these luminescents have a long lifetime
[0009] A disadvantage of luminescent substances based on rare earth metals is that the spectral position of the narrow-band emission can only be slightly influenced by the host lattice
Furthermore, the main substance can only be excited very inefficiently

Method used

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  • Authenticity mark in the form of luminescent substances
  • Authenticity mark in the form of luminescent substances
  • Authenticity mark in the form of luminescent substances

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0044] Chromated Yttrium-Garnet (Cr:Y 3 al 5 o 12 , the original in German: chromaktiviertem Yttrium-Granat)

[0045] Weigh 42.82 grams of alumina (Al 2 o 3 ), 0.15 grams of chromium oxide (Cr 2 o 3 ), 57.03 grams of yttrium oxide (Y 2 o 3 ), and with 100 grams of anhydrous sodium sulfate (Na 2 SO 4 ) are mixed evenly together. The mixture was filled into a corundum crucible, and heated at a temperature of 1150° C. for 12 hours. The resulting reaction product was broken up after cooling and the residues of flux were removed in a water bath. If necessary, the remainder of the chromium oxide used or by-products resulting therefrom, for example sodium chromate, is reduced to chromium(III) by sulfuric acid / iron sulfate and separated off. The resulting product was filtered and dried at a temperature of 100°C.

example 2

[0047] Chromated yttrium-perovskite (Cr:YAlO 3 , the original in German: chromaktiviertem Yttrium-Perowskit)

[0048] Weigh 31.04 grams of alumina (Al 2 o 3 ), 0.09 grams of chromium oxide (Cr 2 o 3 ), 68.87 grams of yttrium oxide (Y 2 o 3 ), and with 100 grams of anhydrous sodium sulfate (Na 2 SO 4 ) are mixed evenly together. The mixture was filled into a corundum crucible, and heated at a temperature of 1150° C. for 18 hours. The resulting reaction product was broken up after cooling and the residues of flux were removed in a water bath. If necessary, the remainder of the chromium oxide used or by-products resulting therefrom, for example sodium chromate, is reduced to chromium(III) by sulfuric acid / iron sulfate and separated off. The resulting product was filtered and dried at a temperature of 100°C. If desired, the material can be ground to the desired particle size by milling.

[0049] Figure 5 An embodiment of the security element according to the inventio...

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Abstract

The invention relates to a printed valuable document comprising an authenticity mark in the form of at least two luminescent substances on the basis of host lattices that are doped with one or more ions. A targeted adjustment of the luminescent properties of luminescent substances can be achieved by the systematic modification of the host lattices and / or ions of the (nd) electron configuration. The combination of said luminescent substances permits a plurality of complex, novel authenticity marks.

Description

technical field [0001] The invention relates to a printed value document bearing an authenticity mark in the form of at least two luminescent substances based on a host lattice doped with one or more ions. Background technique [0002] The term "value document" is understood within the scope of the present invention to mean banknotes, cheques, stock certificates, tokens (Werkmarken), certificates, credit cards, passports and other documents such as labels, stamps, packaging or other elements for product security . [0003] The protection of value documents against forgery by means of luminescent substances has been known for a long time. The use of transition metals and rare earth metals as luminescent ions has been discussed. The advantage of such ions is that they exhibit one or more characteristic narrow-band luminescence according to the corresponding excitation, which facilitates a more reliable detection and demarcation with respect to other spectra. Combinations of...

Claims

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Application Information

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IPC IPC(8): B42D15/00B42D15/10B41M3/14G06K19/06G07D7/12
CPCB41M3/144G07D7/122B42D15/10B42D25/00B42D2035/34B42D25/36G07D7/1205G06K19/14Y10T428/24802B41M3/14B42D15/00G06K19/06G07D7/12
Inventor 斯蒂芬·希尔托马斯·吉林凯伊·U·斯托克格雷戈尔·格劳沃格尔
Owner GIESECKE & DEVRIENT CURRENCY TECHNOLOGY GMBH
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