AUTHENTICITY FEATURE IN THE FORM OF LUMINESCENT SUBSTANCES

摘要

A security element has at least two luminescent substances, in which the security element has a first and a second luminescent substance which have a substantially identical, joint emission band. The first or the second luminescent substance, or both luminescent substances, have at least one excitation band that leads to an emission at the joint emission band only in the case of the first or the second luminescent substance.

主权项

1. A checking method for verifying the presence of the security element including a first luminescent substance having a first emission spectrum; and a second luminescent substance having a second emission spectrum, wherein the first emission spectrum and the second emission spectrum each include at least one substantially identical joint emission band, wherein the first luminescent substance has at least a first excitation band that leads to an emission at the joint emission band, the second luminescent substance has at least a first excitation band that leads to an emission at the joint emission band, and the first excitation band of the first luminescent substance is different than the first excitation band of the second luminescent substance, the method comprising the steps:
illuminating the luminescent substances with a first radiation which has a wavelength lying substantially at the first excitation band of the first luminescent substance; detecting the emission at the substantially identical joint emission band; illuminating the luminescent substances with a second radiation which has a wavelength lying substantially at the first excitation band of the second luminescent substance; and detecting the emission at the substantially identical joint emission band.