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AssigneeBundesdruckerei GmbH
InventorsAndreas Deichsel, Lazar Kulikovsky, Florian Peters
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The invention relates to a security feature for a security and/or value document which comprises a mixture of electrically conductive field displacement elements which are electrically insulated within the security or value document, and a zinc sulfide luminophore in the form of particles, which mixture is applied to a security and/or value document by means of a printing technology. The zinc sulfide luminophore has the general chemical formula ZnS: Cux, My, Xz. Here, M represents one or more elements from a group comprising the chemical elements Co, In and Ni; X represents one or more elements from a group comprising the halides F, Cl, Br and I; 0<x≤0.002; 0<y≤0.00015; and 0≤z≤0.00050. The particles each have cubic phase fractions and hexagonal phase fractions, the zinc sulfide luminophore emitting a first luminescent radiation in the spectral range between 580 nm and 780 nm in the event of excitation by an electrical field, and the zinc sulfide luminophore emitting a second luminescent radiation in the visible spectral range in the event of thermal stimulation and preceding excitation by means of UV radiation. Furthermore, a security and/or value document having a security feature and a method for detection and/or verification of a security feature having a luminophore are provided.
A security feature for a security document and/or document of value, the security feature comprising a mixture, which is applied by means of a printing technology onto a security document and/or document of value, made up of field displacement elements, which are electrically conductive and electrically insulated inside the security document or document of value, and a zinc-sulphidic luminophore in the form of particles, the zinc-sulphidic luminophore having the following generic chemical formula:
Dependencies are inferred from the claim text.