Preparation method of perovskite fluorescent anti-counterfeit structure and perovskite fluorescent anti-counterfeit label

Abstract

The invention provides a preparation method of a perovskite fluorescent anti-counterfeit structure and a perovskite fluorescent anti-counterfeit label. The preparation method comprises the following steps: S1, preparing a perovskite crystal film; and S2, a pattern is etched on the surface of the perovskite crystal film through laser, and the pattern cannot be recognized under natural light and can be recognized under ultraviolet light irradiation. According to the invention, a multi-color and multi-dimensional non-replicable fluorescent anti-counterfeiting structure is developed based on the patterned perovskite array, that is, pattern information for anti-counterfeiting shows extremely high concealment, is completely invisible in a bright field, and can be shown only when irradiated by ultraviolet light; the erasable-rewritable characteristic can be realized by combining high-temperature annealing; fluorescence of different colors can be obtained by adjusting the halogen ratio in the precursor solution, and a diversified and high-safety optical anti-counterfeiting structure is achieved.

Description

technical field [0001] The invention relates to the technical field of fluorescent anti-counterfeiting, in particular to a preparation method of a perovskite fluorescent anti-counterfeiting structure and a perovskite fluorescent anti-counterfeiting label. Background technique [0002] Existing anti-counterfeiting technologies include printed patterns, watermarks, barcodes, optical anti-counterfeiting, laser holograms, and radio frequency identification. Among them, optical anti-counterfeiting technology has the characteristics of bright luminous color, convenient visual readout, easy detection, etc., and is favored in the field of anti-counterfeiting. At present, the most mature optical anti-counterfeiting is based on fluorescence. [0003] However, fluorescent anti-counterfeiting technology still suffers from the following disadvantages: it requires multi-step synthesis process, involves complex surface engineering, is time-consuming, and has high cost; heavily relies on e...

AI Technical Summary

Problems solved by technology

[0003]However, the fluorescent anti-counterfeiting technology still has the following disadvantages: it requires a multi-step synthesis process, involves complex surface engineering, is time-consuming, and has high costs; it relies heavily on expensive Instruments, such as mass spectrometry, dark field microscopy, electrochemiluminescence and vibrational spectroscopy, etc., have high commercial costs; most luminescent materials exhibit a single mode of luminescence, which is easy to be counterfeited and lead to information leakage; more importantly, most rely on Deterministic material production process, easily predicted and copied by counterfeiters, still faces the risk of being counterfeited

[0005] However, these patterned anti-counterfeiting technologies all have disadvantages: photolithography technology relies on masks to achieve patterning, which requires various cumbersome processing steps, complicated processes and high The cost hinders its wide application; the precision of nanoimprinting is not high, and it is difficult to make a large area, the template is easily damaged, and the service life is difficult to guarantee, which is likely to deteriorate the performance of perovskite materials; inkjet printing requires special formulations of inks and The substrate is heated and the ink is in direct contact with the nozzle wall, causing the nozzle to clog and making it difficult to precisely control the crystallization process

Images