PRINTED SECURITIES WITH LUMINESCENCING INDICATION OF AUTHENTICITY Russian patent published in 2003 - IPC

FIELD: documents protected against forgery. SUBSTANCE: printed securities has at least one indication of authenticity made with the use of a luminescensing substance based on alloyed at least by one rare-earth metal of crystal lattice base, which absorbs radiation and is excited mainly in the visible spectral region and is transparent at least in separate sections of the infra-red spectral region. Holmium serves as the rare-earth metal, and the luminescensing substance is present in the volume of the material of the securities on the layer applied onto the layer of the securities in such a maximum allowable concentration that does not worsen the properties of the given securities or layer. The protective layer has a substrate and a luminescence substance based on the crystal lattice alloyed at least by one rare-earth metal. The luminescence substance is present in the material of the substrate or on the layer applied onto it in such a maximum allowable concentration that does not worsen the properties of the protective element or layer. EFFECT: enhanced degree of protection. 28 cl, 3 dwg