Fluorescent fibre for anti-counterfeiting document and anti-counterfeiting file

Abstract

The invention relates to fluorescent fiber for use in an anti-counterfeiting document and the anti-counterfeiting document. The fluorescent fiber shows red when excited by 254nm ultraviolet light and shows no color in natural light and 365nm ultraviolet light, and is characterized in that a fluorescent compound added into the fluorescent fiber is a europium phosphate-vanadate and / or europium vanadate. The fluorescent fiber preparation from the europium vanadate (phosphate) shows no color in natural light and 365nm ultraviolet light and shows bright red in 254nm ultraviolet light. At the same time, the fluorescent fiber has the advantages of stable performance, excellent durability, high luminous quantum efficiency and so on, wherein the excellent durability lies in that the anti-counterfeit performance of the fluorescence is not changed after the fluorescent fiber is processed in severe environments such as acid, alkali, organic solvent, hot water, washing agent, and sunshine. Due to the stable performance, the fluorescent fiber can maintain anti-counterfeiting function for a long time after being added into paper and thus has good utility value.

Description

Technical field: [0001] The invention relates to the field of anti-counterfeiting, in particular to a fluorescent fiber used for anti-counterfeiting documents and an anti-counterfeiting document using the fluorescent fiber. Background technique: [0002] The use of fluorescent fibers in the field of anti-counterfeiting, that is, adding fluorescent fibers to pulp in the papermaking process to copy anti-counterfeiting documents with anti-counterfeiting effects, is already a common anti-counterfeiting means for valuable securities, banknotes, and identity documents. At present, fluorescent fibers are excited by ultraviolet excitation light to emit visible light in two ways: fluorescent fibers generate visible light of the same color for different wavelengths of ultraviolet excitation light or generate different colors of visible light for different wavelengths of ultraviolet excitation light. The ultraviolet wavelengths of different bands in the prior art generally refer to ult...

AI Technical Summary

Problems solved by technology

However, at present, the fluorescent powder used to prepare this fluorescent fiber is an organic compound or its complex, which has the disadvantages of unstable performance and poor tolerance, so it cannot be practically applied in the field of anti-counterfeiting

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