AUTHENTICATION SYSTEMS FOR DISCRIMINATING VALUE DOCUMENTS BASED ON VARIABLE LUMINESCENCE AND MAGNETIC PROPERTIES

摘要

A value document authentication system comprising a value document entry having a light emitting compound disposed on or within at least a portion of a value document entry, the light emitting compound comprising: (i) a host having at least one metal ion Lattice, and is doped with at least one rare earth ion capable of emitting infrared radiation when excited by an excitation light source having sufficient energy to excite the emission from the luminescent compound, (ii) The ratio has the predetermined ratio such that it corresponds to a parameter of a pre-selected criterion, all of which are measured at the same location in the value document and used to authenticate the value document.;