COMPOSITE LUMINESCENT MATERIAL AND METHOD FOR PRODUCTION THEREOF Russian patent published in 2021 - IPC C09K11/08 B42D25/36 D21H21/40 D21H21/48 

FIELD: composite materials.

SUBSTANCE: invention relates to production of special materials intended for use as marking of valuable objects for the purpose of reliable determination of the authenticity thereof. The composite material based on one inorganic heat-dependent luminescent compound and one luminescent compound exhibiting the property of induction heating in an alternating magnetic field of a predetermined intensity and frequency constitutes a permanent connection of said components in the form of a single material in the form of a fine powder. Under simultaneous or consecutive exposure to exciting radiation in the range of 200 to 1,600 nm and an alternating magnetic field with a frequency of 100 to 10⁶ Hz and an intensity of 10 to 10,000 Oe, the composite material exhibits the property of a predetermined change in the luminescence parameters in the optical spectrum range of 300 to 3,000 nm. Proposed are methods for producing the composite material.

EFFECT: invention provides a possibility of providing a high level of protection of the information storage medium and controlling the authenticity thereof in the conditions of circulation.

7 cl, 4 ex, 2 tbl