Valuable document having a substrate element and a foil element, and method for classifying a valuable document
A value document with a carrier element and a foil element arranged in a partial region of the carrier element. The carrier element has, at least in the partial region, a luminescence marker which is adapted to give off luminescence radiation which has at least a first wavelength and a second wavelength in each case in the infrared spectral region. The foil element has a reflection layer and a spectral selection layer. The selection layer is arranged between the carrier element and the reflection layer. The reflection layer is configured to reflect infrared radiation and the selection layer is configured to spectrally selectively inhibit transmission of infrared radiation. The inhibition of the transmission of the first wavelength and the inhibition of the transmission of the second wavelength differ by at least 10%.
1. A value document with a carrier element and a foil element arranged in a partial region of the carrier element,
wherein the carrier element has, at least in the partial region, a luminescence marker which is adapted to give off luminescence radiation which has at least a first wavelength and a second wavelength in each case in the infrared spectral region, and
wherein the foil element has a reflection layer and a spectral selection layer,
wherein the selection layer is arranged between the carrier element and the reflection layer,
wherein the reflection layer is configured to reflect infrared radiation and the selection layer is configured to spectrally selectively inhibit transmission of infrared radiation,
wherein the inhibition of the transmission of the first wavelength and the inhibition of the transmission of the second wavelength differ by at least 10%.
2. The value document according to claim 1 , wherein the foil element is configured as a security element constructed in layered fashion.
3. The value document according to claim 1 , wherein the foil element is configured as a patch and/or hologram and/or security thread and/or security strip.
4. The value document according to claim 1 , wherein the foil element is applied to a surface of the carrier element.
5. The value document according to claim 1 , wherein the reflection layer and the selection layer are configured to overlap when viewed perpendicular to the carrier element.
6. The value document according to claim 1 , wherein the selection layer is configured as an absorption layer.
7. The value document according to claim 1 , wherein the reflection layer has a reflection spectral region, and the selection layer has a selection spectral region,
wherein the reflection spectral region is more broadband than the selection spectral region.
8. The value document according to claim 1 , wherein the reflection layer is adapted to reflect at least 50% of a luminescence radiation irradiated by the luminescence marker and incident on the reflection layer.
9. The value document according to claim 1 , wherein the luminescence marker is embedded in the carrier element.
10. The value document according to claim 1 , wherein the value document has a document-class-specific spectral signature which is dependent on a luminescence radiation irradiated by the luminescence marker and incident on the selection layer.
11. A method for classifying a value document with a carrier element having a luminescence marker and a foil element arranged in a partial region of the carrier element and having a reflection layer, in which the following steps are performed:
a) exciting the luminescence marker with radiation from an excitation side of the value document, the excitation side being the side of the value document facing away from the foil element;
b) capturing an intensity of the infrared luminescence radiation irradiated by the excited luminescence marker and reflected by the reflection layer;
c) comparing the captured intensity with a reference intensity; and
d) classifying the value document based on the comparison;
wherein the luminescence radiation irradiated by the excited luminescence marker is spectrally inhibited by a selection layer of the foil element before the capture in step b.
12. The method according to claim 11 , wherein as the captured intensity, at least a first intensity of a first wavelength and a second intensity of a second wavelength each in the infrared spectral region are captured.
13. The method according to claim 11 , wherein a direct luminescence intensity of the luminescence marker outside the partial region is captured on the direct way of propagation, and in step d) the classification is performed based on the direct luminescence intensity and the intensity captured in step b).
14. The method according to claim 11 , wherein the reference intensity is made available by a direct luminescence intensity of the luminescence marker captured outside the partial region and on the direct way of propagation.