VALUABLE DOCUMENT Russian patent published in 2010 - IPC C09K11/08 B44F1/12 G06K19/14 

FIELD: information technology.

SUBSTANCE: counterfeit protected paper, protective element or valuable document contains a luminophor of general formula XZO₄, in which X denotes Y_bLa_cPr_eNd_fEr_nYb_pFe(III)_v, where b + c + e + f + n + p + v=1, and each of indices b, c, e, f, n, p, v assumes a value between 0 and 1, where either n≠0 and p≠0, or f≠0 and p≠0, or n≠0and f≠0, Z denotes Nb_zaTa_zbP_zd, where za + zb + zd = 1, and each of the indices za, zb and zd assumes a value between 0 and 1. The luminophor can be added to printing ink, can be deposited on a surface or entered into the volume of the valuable document and can be embedded into the composition of melange fibres, protective threads. The valuable document can be made from paper or a polymer, the protective element can be made in form of a strip, tape, thread, plate, melange fibre or label. To authenticate the document, duration of luminescence or wavelength and/or number and/or form and/or intensity of the line of the radiation emitted by the luminophors and/or the band exciting radiation is analysed. The lines of radiation emitted by the luminophors and/or bands of exciting radiation form a code.

EFFECT: increase in number of luminophors used during authentication.

48 cl, 1 dwg, 2 tbl, 7 ex