Alkali metal and alkaline earth metal niobates and tantalates as security feature substances

摘要

The invention relates to a security feature having a luminescent substance with the general formula AXO3:Z (I) or B0.5XO3:Z (II) or A1-2yByXO3:Z (III), where A is an alkali metal, B is an alkaline earth metal, X stands for Nb or Ta, Z is the luminescence activator, and y lies between 0 and 0.5. The invention also relates to a security element, a security paper and a value document which is equipped with the security feature according to the invention, and to the use of the luminescent substance with the general formula (I), (II) or (III) as a feature substance for authentication. The luminescent substance is obtained by annealing solid starting materials.

主权项

1. A security feature, comprising at least one luminescent substance for authentication of a security element, a security paper, a value document or another object, the at least one luminescent substance having a host lattice doped with at least one luminescence activator, wherein the at least one luminescent substance has the general formula
B0.5XO3:Z  (I) A1-2yByXO3:Z  (II)where
A is at least one element selected from the group consisting of alkali metals, B is at least one element selected from the group consisting of alkaline earth metals, X is either or both Nb and Ta, Z is the luminescence activator, and is at least one element selected from the group consisting of the rare earth metals and transition metals in the oxidation states in which the relevant transition metals are activatable to luminesce, and 0acts as a luminescent sensitizer, and/orserves to suppress certain emission wavelengths, and/orserves for charge equilibration.