| 简介 |
The invention concerns a printed valuable document with at least one authentication 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 light in the entire visible region of the spectrum, is excitable in substantial parts of the visible region of the spectrum, and is at least partially transparent at least in the wavelength range between 0.8 mum and 1.1 mum. The host lattice also features a garnet or perovskite structure. The rare earth metal emits light in the wavelength range between 0.8 mum and 1.1 mum. |
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