Authenticity mark in the form of a luminescent substance
View Patent ↗A printed document of value having at least one authenticity feature in the form of a luminescent substance on the basis of host lattices which are doped with one or a plurality of ions. Since the host lattices are doped with different ions, exchange interactions between clusters of ions that occur leads to cooperative effects.
1. An authenticity feature for documents of value comprising a luminescent substance having host lattices doped with doping ions,
wherein the doped ions form exchange-coupled clusters with other doped ions and/or with ions of the host lattices,
wherein said exchange-coupled clusters produce cooperative effects between the doping ions and/or the host lattices to emit luminescence, and
wherein the doped ions have the electron configuration (3d) 2 , (3d) 3 or (3d) 6 or respective electron configurations of the (4d) or (5d) transition metals.
2. The authenticity feature according to claim 1 , wherein the cooperative effects result from the exchange interaction between unpaired electrons of neighboring ions.
3. The authenticity feature according to claim 1 , wherein the host lattices are pure or mixed compounds selected from the group consisting of the metals of the main groups I, II, transition metals and rare earths and at least one non-metal selected from the group consisting of main groups III, IV, V, VI and VII of the periodic system of elements.
4. The authenticity feature according to claim 1 , wherein the host lattices are pure or mixed compounds selected from the group consisting of the rare earths elements and at least one non-metal selected from the group consisting of the main groups III to VII of the periodic system of elements.
5. The authenticity feature according to claim 4 , wherein said compounds additionally contain a compound selected from the group consisting of the metals of the main group I, II and the transition metals.
6. The authenticity feature according to claim 1 , wherein the luminescent substance is present as a pigment particle.
7. A document of value comprising an authenticity feature according to claim 1 , wherein the document of value comprises paper and/or plastic material.
8. The document of value according to claim 7 , wherein the authenticity feature is incorporated in the volume of the document of value and/or is applied onto the document of value.
9. The document of value according to claim 7 , wherein the luminescent substance is an invisible at least partial coating on the document of value.
10. The document of value according to claim 7 , wherein the luminescent substance is admixed with a printing ink.
11. The document of value according to claim 7 , wherein the luminescent substance is combined with at least one different authenticity feature.
12. The document of value according to claim 7 , wherein at least two luminescent substances form a spectral coding in at least one spatial dimension.
13. A security element, comprising a carrier material and at least one authenticity feature according to claim 1 , wherein the authenticity feature is embedded in the carrier material and/or is applied onto the carrier material.
14. The security element according to claim 13 , wherein the security element is in the form of a strip or band.
15. The security element according to claim 13 , wherein the carrier material is formed as a security thread, planchet or mottling fiber.
16. The security element according to claim 13 , wherein the security element is formed as a label.
17. A method for producing a document of value according to claim 7 , wherein the luminescent substance is added to a printing ink.
18. The method for producing a document of value according to claim 7 , wherein the luminescent substance is applied by a coating process.
19. The method for producing a document of value according to claim 7 , wherein the luminescent substance is worked into the volume of the document of value.
20. The method for producing a document of value according to claim 7 , wherein the luminescent substance is supplied to the document of value in the form of prepared mottling fibers.
21. The method for producing a document of value according to claim 7 , wherein the luminescent substance is supplied to the document of value in the form of a prepared security thread.
22. A test method for authenticity testing an authenticity feature according to claim 1 , wherein at least one property of the luminescent substances is evaluated.
23. The test method for authenticity testing according to claim 22 , wherein wavelengths and/or number and/or shape and/or intensity of the emission lines of the luminescent substances are evaluated.
24. The test method for authenticity testing according to claim 22 , wherein the luminescence lifetimes of the luminescent substances are evaluated.
25. The test method for authenticity testing according to claim 22 , wherein the evaluation is effected at different temperatures.
26. The test method for authenticity testing according to claim 22 , wherein when evaluating a spatial distribution of the luminescent substance or the luminescent substances is verified.