Visible‐Light‐Driven Photoswitchable Fluorescent Polymers for Photorewritable Pattern, Anti‐Counterfeiting, and Information Encryption

Abstract

Photoswitchable fluorescent polymers (PFPs) are emerging as a class of promising systems for photowritable pattern, optical anti‐counterfeiting, and information encryption. They typically use harmful UV light as the stimulus, which often leads to inevitable photobleaching and poor reversibility. To address this issue, visible‐light‐driven PFPs by copolymerization of novel negative photochromic spiropyran monomer and methyl acrylate are developed. The obtained copolymers display bright red fluorescence, which can be reversibly turned off by visible light irradiation. Many appealing features are observed in this system, including fast photo‐responsibility, prominent photo‐reversibility and photostability, simple preparation process, and processability. Their applications in photorewritable patterns, optical anti‐counterfeiting, and information encryption are also demonstrated.

Dual host–guest interaction-mediated photoswitchable fluorescent supramolecular polymers for anti-counterfeiting and encryption

“…Information encryption and anti-counterfeiting play an important role in daily life, such as information security, and avoiding the loss caused by imitation. 7,[48][49][50][51][52] We first investigated the potential application in information encryption based on the binary codes of the standard 8-bit ASCII characters. SPS-5 containing NC-DSA-CN and SPS-4 containing NC-DSA-CN and CDSP were selected as encryption units to create information lattices (Fig.…”

“…Photoswitchable fluorescent polymers (PFPs) have attracted considerable interest and are widely used in bioimaging, multicolor security inks, information encryption, and anti-counterfeiting because of the non-destructiveness and spatial controllability of light. [1][2][3][4][5][6][7][8][9][10][11][12] In these PFPs, fluorescent dyes (donor) and photochromics (acceptor) were covalently integrated into polymer networks to achieve a light-regulated fluorescence resonance energy transfer (FRET) process. 4,5,13 Thus, their fluorescent signal could be tuned reversibly by the alternating change of light (UV and Vis).…”

“…Owing to the flexible design and easy preparation, many phtotoswitchable fluorescent polymeric nanoparticles and films have been developed for the construction of encryption or anti-counterfeiting system. 4,7,[14][15][16][17][18] However, nanoparticles with poor processability and films with low flexibility in the regulation of optical performance still hinder their applicability in anticounterfeiting and information encryption. [19][20][21] Therefore, the development of novel PFPs with excellent processability and the flexibility of optical performance regulation are desired for anticounterfeiting and encryption.…”

Multicolor Fluorescent Inks Based on Lanthanide Hybrid Organogels for Anticounterfeiting and Logic Circuit Design

“…Counterfeiting is a growing global problem involving currency, artwork, luxury goods, confidential documents, governments, businesses, and individuals, 1−4 and there is an urgent need for anticounterfeiting technologies that are easy to identify, authenticate, and difficult to replicate. Over the past few decades, a variety of technologies, such as hologram, 5 watermarking, 6 security code, 7,8 and fluorescent pattern, 9,10 have been developed for anticounterfeiting application. Among the existing anticounterfeiting technology, the fluorescent materials are widely used because of their color luminescence, good visibility, and simple design.…”

A Smart Single‐Fluorophore Polymer: Self‐Assembly Shapechromic Multicolor Fluorescence and Erasable Ink

“…[28][29][30] The fluorescent materials with stealth properties have the potential to be utilized as inks for information encryption and anticounterfeiting. [22,[31][32][33][34][35][36][37] In realworld scenarios, information that requires anticounterfeiting or encryption is often printed on paper, which remains the most widely used information carrier to date. Therefore, ink used for these purposes should possess certain advantages.…”