Information encryption method of perovskite-polymer composite film and application thereof

Abstract

The invention provides an information encryption method of a perovskite-polymer composite film and application thereof. The method comprises the following steps: S1, preparing a flexible composite film of perovskite and a polymer by using a swelling-deswelling method; s2, utilizing laser to etch patterning information on the composite film; and S3, after the composite film etched with the patterned information is immersed in water, a trace amount of water permeates to passivate defects, and fluorescence is driven to recover, so that controllable erasing of the written information is realized. According to the perovskite-polymer composite film prepared by the invention, the effects of invisible writing and soaking controllable erasing under a bright field (natural light and the like) can be realized by adjusting the power of etching laser and applying different information reading means (the bright field, fluorescence and soaking fluorescence), so that information with difference can be obtained, and the application range of the perovskite-polymer composite film is widened. The hierarchy and complexity of information encryption are improved, and multiple encryption / decryption is realized.

Description

technical field [0001] The invention relates to the technical field of information encryption, in particular to an information encryption method of a perovskite-polymer composite film and its application. Background technique [0002] Stimuli-responsive materials refer to a class of materials whose physical and chemical properties change correspondingly under external stimuli such as light, heat, electricity, force, and moisture, and can be converted into detectable signals for feedback to the outside world. For example, phase change materials, hydrogels, carbon quantum dots, and perovskite materials are sensitive to external stimuli, have high signal-to-noise ratios and complex response strategies, and are therefore considered ideal candidates for information storage, encryption and anti-counterfeiting applications. By. [0003] However, traditional stimuli-responsive materials often require complex preparation processes and high costs, and some stimuli conditions are also...

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Problems solved by technology

[0003] However, traditional stimuli-responsive materials often require complex preparation processes and high costs, and some stimuli conditions are relatively harsh, such as specific chemical reagents, which may cause damage to the protected object and are not environmentally friendly.

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