Security feature and method for the detection thereof, and security or value document

US12017471B2 · kind B2 · utility

Assignee

• BUNDESDRUCKEREI GMBH · DE

Inventors

• Detlef Starick · Berlin, DE
• Manfred Paeschke · Wandlitz, DE
• Florian Peters · Berlin, DE
• Roland HEISE · Berlin, DE
• Guido HAUSSMANN · Berlin, DE
• Andreas DEICHSEL · Berlin, DE
• Matthias KOCH · Berlin, DE
• Monika Voh · Heringen/Helme, DE
• Sven Rösler · Eisenach, DE
• Sylke Rösler · Eisenach, DE
• Adrie BOS · Houten, NL

Key dates

• Filing date: Apr 26, 2021
• Grant date: Jun 25, 2024
• Expiry date: Jun 20, 2041

Classification

• Technology area (CPC G): Physics
• CPC primary: G07D7/205
• WIPO field: Basic materials chemistry
• WIPO sector: Chemistry

Abstract

The present invention firstly relates to a security feature for a security or value document. The security feature comprises a zinc sulfide luminophore in the form of particles. 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; and the following applies: 0<x<0.002 and 0≤y<0.00015 and 0≤z<0.00050. The particles each have cubic phase portions and hexagonal phase portions. When excited by an electrical field, the zinc sulfide luminophore emits a first radiation in the range of the light spectrum between 580 nm and 780 nm. When excited by heating the luminophore to a temperature between 100° C. and 150° C., the zinc sulfide luminophore emits a second radiation in the light spectrum. Furthermore, the invention relates to a security and value document, which may for example be a bank note or a passport, an identity card, a driving license or a postage stamp. The invention also relates to a method for detecting and/or verifying the security feature according to the invention…