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US 10,836,198 B2Granted
Securing the authenticity of value documents by means of characteristic substances
AssigneeGiesecke+Devrient Currency Technology GmbH
InventorsUlrich Scholz, Gregor Grauvogl
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Abstract
A feature substance is provided for securing the authenticity of documents of value, having at least one luminescent substance in particle form and nanoparticles enveloping the surfaces of the luminescent substance particles at least partially, wherein the properties of the feature substance result from the interaction of the properties of the luminescent substance and of the nanoparticles. The invention furthermore relates to a method for producing the feature substance, a method for securing the authenticity of a security element or document of value using a feature substance, as well as security elements and documents of value with authenticity features on the basis of the feature substance.
Claims28
A security element or document of value comprising a feature substance;
- wherein the feature substance is applied on at least partial areas of at least one surface of the security element or document of value, or the feature substance is integrated in at least one partial area of the volume of the security element or document of value;
- wherein the feature substance is configured for securing the authenticity of documents of value, the feature substance comprising at least one luminescent substance in particle form, the at least one luminescent substance being excitable by radiation in at least one of the infrared, visible and ultraviolet spectrum to emit luminescence;
- wherein the particles of the luminescent substance are enveloped at least partially by nanoparticles;
- wherein the nanoparticles are bound to surfaces of the particles of the luminescent substance by adhesive forces;
- wherein the nanoparticles absorb in at least one wavelength range in which the luminescent substance emits, such that the luminescence spectrum of the feature substance results from the interaction of the luminescence emission properties of the luminescent substance and the absorption properties of the nanoparticles;
- and
- wherein the weight ratio of luminescent substance particles to nanoparticles is in the range of 10:1 to 1:10.
4 more elements
A security element or document of value comprising a feature substance;
- wherein the feature substance is applied on at least partial areas of at least one surface of the security element or document of value, or the feature substance is integrated in at least one partial area of the volume of the security element or document of value;
- wherein the feature substance is configured for securing the authenticity of documents of value, the feature substance comprising at least one luminescent substance in particle form, the at least one luminescent substance being excitable by radiation in at least one of the infrared, visible and ultraviolet spectrum to emit luminescence;
- wherein the particles of the luminescent substance are enveloped at least partially by nanoparticles;
- wherein the nanoparticles are bound to surfaces of the particles of the luminescent substance by adhesive forces;
- wherein the nanoparticles absorb in at least one wavelength range in which the luminescent substance emits, such that the luminescence spectrum of the feature substance results from the interaction of the luminescence emission properties of the luminescent substance and properties of the nanoparticles;
- wherein the security element or document of value is subjected to electrical or magnetic fields during the application or integration of the feature substance such that an orientation and/or a migration of the particles of the feature substance within the electrical or magnetic field takes place;
- and
- wherein the weight ratio of luminescent substance particles to nanoparticles is in the range of 10:1 to 1:10.
5 more elements
A security element or document of value comprising a feature substance;
- wherein the feature substance is applied on at least partial areas of at least one surface of the security element or document of value, or the feature substance is integrated in at least one partial area of the volume of the security element or document of value;
- wherein the feature substance is configured for securing the authenticity of documents of value, the feature substance comprising at least one luminescent substance in particle form, the at least one luminescent substance being excitable by radiation in at least one of the infrared, visible and ultraviolet spectrum to emit luminescence;
- wherein the particles of the luminescent substance are enveloped at least partially by nanoparticles;
- wherein the nanoparticles are bound to surfaces of the particles of the luminescent substance by adhesive forces;
- wherein the nanoparticles absorb in certain wavelength ranges in which the luminescent substance emits, such that the luminescence spectrum of the feature substance results from the interaction of the luminescence emission properties of the luminescent substance and properties of the nanoparticles;
- wherein the security element or document of value is subjected to electrical or magnetic fields during the application or integration of the feature substance such that an orientation and/or a migration of the particles of the feature substance within the electrical or magnetic field takes place;
- and
- wherein the weight ratio of luminescent substance particles to nanoparticles is in the range of 10:1 to 1:10.
5 more elements
Dependencies are inferred from the claim text.