| 简介 |
The invention relates to a printed valuable document with at least one authenticity mark in the form of a luminescent substance based on a host lattice doped with at least one rare earth metal. The host lattice largely absorbs in the visible region of the spectrum and is excitable in the visible region of the spectrum, and is transparent in at least parts of the IR spectral region. The rare earth metal is holmium. The luminescent substance is present in the volume of the valuable document in such a concentration that the properties of the valuable document just remain unimpaired. |
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