Niobates and tantalates alkali metal and alkaline substances as security features

摘要

Security feature, comprising at least one luminescent substance to ensure the authenticity of a security element, security paper, a value document or other object, wherein the at least one luminescent substance comprises a network host doped with at least an activator of luminescence, characterized in that the at least one luminescent substance, having the general formula AXO3: Z (I) wherein a is at least one element of the group comprising alkali metal, preferably Li, Na and K, X is Nb and / or Ta, Z is the activator luminescence and at least one element of the group comprising rare earth metals and transition metals, in the states oxidation which can be activated luminescence of corresponding transition metals, and wherein the host lattice is doped additionally one or more elements E, that - act as sensitizers luminis cence that they absorb energy and transfer it to the luminescent activators and are selected from the group of cations of transition metals, and / or - are used to compensate the load, the element that serves to compensate the charge being selected from the group of cations transition metals or cations of the elements of the third and fourth main group, and preferably being titanium in the +4 oxidation state or aluminum in the +3 oxidation state.