A preparation method of up-conversion fluorescent anti-counterfeiting label

Abstract

The invention discloses a method for preparing an up-conversion fluorescent anti-counterfeit label, comprising the steps of: surface treatment of a conductive substrate, preparation of a patterned photoresist conductive substrate, configuration of an electrolyte, preparation of a patterned conductive substrate by electrochemical deposition, and deglue and heat treatment, and finally obtain a patterned film with up-conversion luminescence characteristics. This method combines solution electrochemical deposition and microelectronic processing methods to make the up-conversion fluorescent anti-counterfeiting label have high spatial resolution and high concealment. The prepared patterned film has multiple There are two sub-patterns that can emit different fluorescence, and each pattern can excite visible fluorescence of different colors under the irradiation of invisible near-infrared light.

Description

technical field [0001] The invention belongs to the field of optoelectronic information materials, and in particular relates to a method for preparing an up-conversion fluorescent anti-counterfeiting label. Background technique [0002] Counterfeit and shoddy goods seriously damage the rights and interests of consumers, and at the same time cause huge economic losses to the society. Develop anti-counterfeiting technology and high-efficiency coding strategies to realize accurate and confidential identification of commodity circulation, which is conducive to protecting brand value and consumer rights. Under light irradiation, fluorescent labels will display specific fluorescent coded information, which is an important commercial anti-counterfeiting technology. Commonly used materials such as organic fluorescent dye molecules and semiconductor fluorescent quantum dots have the advantages of high luminous efficiency and adjustable luminous color, but they face the limitations o...

AI Technical Summary

Problems solved by technology

At present, there are three important limitations in up-conversion fluorescent inks. One is that the higher the content of up-conversion fluorescent nanoparticles, the stronger the fluorescence, but too high a concentration will easily cause particle agglomeration and precipitation, resulting in ink failure; the second is the surface modification molecules of nanoparticles. It is easy to fall off, leading to the aggregation and precipitation of nanoparticles, which leads to the failure of the ink; the third is that during the drying process of the printed ink, because the evaporation rate of the volatile medium at the edge of the droplet is greater than the evaporation rate at the center, an outward capillary flow is generated inside the droplet, and the suspended The up-conversion fluorescent particles are carried to the edge of the droplet and precipitate into a ring at the edge, that is, the coffee ring effect, resulting in uneven distribution of nanoparticles, reducing the uniformity of the film, fluorescent spatial resolution and anti-counterfeiting effect

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