| 摘要 |
FIELD: printing industry. ^ SUBSTANCE: valuable document has marking, which contains luminescent compound that has both anti-stokes and Stocks law luminescence, with composition of Ln 1-X-Y-Z YbX ErY CeZ MeIÇèC MeVIÇèD PI-D O4+D/2-C where: MeI - Li or Na, MeVI - W or Mo, Ln - Y, La, Gd, 0.1 ëñ x ëñ 0.9; 0.005 ëñ y ëñ 0.2; 0.0001 ëñ z ëñ 0.01; 0.001 ëñ c ëñ 0.1; 0.001 ëñ d ëñ 0.1; or compound of the following composition: Ln 2-X-Y-Z YbX ErY CeZ O2 S, where Ln - Y, La, Gd, 0 <x ëñ 0.2; 0.1 ëñ y ëñ 0.4; 0.0001 ëñ z ëñ 0.005; or compound of the following composition: Ln 2-X-Y-Z ErY CeZ O2 S; where Ln - Y, La, Gd, 0 < x ëñ 0.2; 0.1 ëñ y ëñ 0.4; 0.0001 ëñ z ëñ 0.005. Marking may be made by printing method, for instance offset method of printing. Method for identification of valuable document authenticity with all above mentioned criteria inherent in it includes detection of hidden protective marking on a valuable document by measurement and further analysis of dependency extent of stokes and anti-stokes luminescence strip intensity on density of excitation radiation capacity. ^ EFFECT: improved level of valuable document protection. ^ 6 cl |
