Fluorescent structural color anti-counterfeiting material and preparation method thereof

By combining halide perovskite fluorescent particles loaded with mesoporous silica microspheres with monodisperse silica nanoparticles, and then using rotary heating evaporation and curing encapsulation, the problem of fluorescent structural color materials being easily affected by polar solvents was solved. This achieved angle-dependent structural color with high color saturation and fluorescent anti-counterfeiting effect, simplified the preparation process, and made it suitable for large-scale production.

CN118580705BActive Publication Date: 2026-06-02HARBIN INSTITUTE OF TECHNOLOGY (SHENZHEN) (INSTITUTE OF SCIENCE AND TECHNOLOGY INNOVATION HARBIN INSTITUTE OF TECHNOLOGY SHENZHEN)
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
HARBIN INSTITUTE OF TECHNOLOGY (SHENZHEN) (INSTITUTE OF SCIENCE AND TECHNOLOGY INNOVATION HARBIN INSTITUTE OF TECHNOLOGY SHENZHEN)
Filing Date
2024-05-17
Publication Date
2026-06-02

AI Technical Summary

Technical Problem

Existing fluorescent structural color materials are easily affected by polar solvents, leading to fluorescence quenching. Furthermore, the process of preparing photonic crystal templates is cumbersome, making it difficult to achieve angle-dependent structural colors with high color saturation and fluorescent anti-counterfeiting effects.

Method used

Halogen perovskite fluorescent particles are loaded onto mesoporous silica microspheres, which are then mixed with monodisperse silica nanoparticles through surface modification and rotary heating evaporation to form a concentrated coating. The coating is then encapsulated in situ through photocuring or thermal curing to form a periodically ordered fluorescent structural color material.

Benefits of technology

It achieves the stability of fluorescent particles in polar solvents, possesses both angle-dependent structural color and UV-excited fluorescence anti-counterfeiting effects, simplifies the preparation process, is suitable for large-scale production, and improves the stability and duplication resistance of anti-counterfeiting materials.

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Abstract

The application provides a fluorescent structural color anti-counterfeiting material and a preparation method thereof, and the preparation method comprises the following steps: preparing composite fluorescent particles of mesoporous silica microsphere loaded halogen perovskite fluorescent particles CsPbX3, wherein X is Br, Cl or I; mixing the composite fluorescent particles with monodisperse silica nanoparticles, resin, a solvent, an initiator and an additive to obtain a mixture, wherein the volume percentage of each component in the mixture is as follows: 25-65% of the nanoparticles, 35-75% of the resin, 0.01-10% of the initiator, and 5-90% of the solvent, and the mass of the composite fluorescent particles is 0.01-3% of the mass of the silica nanoparticles; performing rotary evaporation on the mixture under vacuum to obtain concentrated paint, and after photocuring or thermal curing, the anti-counterfeiting material is obtained. The anti-counterfeiting material of the technical scheme has the dual anti-counterfeiting effects of structural color anti-counterfeiting under natural light and fluorescent anti-counterfeiting under ultraviolet excitation.
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