FIELD: printing.
SUBSTANCE: protective feature according to invention includes a luminescent pigment, which is doped with first phosphor and second phosphor crystal lattice, first phosphor excitation energy is transferred to second phosphor. However, energy of excitation in luminescent pigment according to invention is not completely, but only partially transferred. Partial transfer of excitation energy is achieved by that fraction of amount of substance of first phosphor and second phosphor in luminescent pigment is selected in a suitable manner. Due to incomplete energy transfer disturbance emitted by luminescent pigment luminescent light has, apart from luminescent peak of second phosphor, also a luminescent peak of first phosphor.
EFFECT: proposed invention relates to protective feature for protection of valuable documents, primarily for provision of authenticity of valuable documents.
17 cl, 2 dwg
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|---|---|---|---|
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