Double‐State Anticounterfeiting Labels Based on Light‐Emitting Polymer‐Stabilized Blue Phase

Abstract

Anticounterfeit labels with multiple information‐carrying functions serve a critical role in boosting security and minimizing counterfeit‐related losses, whose development remains challenging. Here, a security label with the ability to encode information in reflective and fluorescent sates is fabricated from light‐emitting polymer‐stabilized blue phase (LE‐PSBP) liquid crystals (LCs). The LE‐PSBP with temperature‐dependent reflective color can be encoded with information by UV irradiation through photomasks. On the other hand, introduction of a fluorescent molecule, which can be easily photocyclized upon UV irradiation, enables the convenient encoding of fluorescent information without impacting the reflective information. As an illustration, a security label with distinct information in reflective and fluorescent states is demonstrated. Such innovative security labels have tremendous potential to provide a platform for multi‐information encoding to enhance the protection level in anticounterfeiting technology.

Efficient Multi-stimulus-Responsive Luminescent Eu(III)-Modified HOFs Materials: Detecting Thiram and Caffeic Acid and Constructing a Flexible Substrate Anti-counterfeiting Platform

“…Therefore, the luminescence anti-counterfeiting platform has gained widespread attention . Anticounterfeit optical materials include organometallic frameworks, , carbon dots, , quantum dots, , perovskites, , and polymer dots, whose fluorescence can be excited, quenched, or tuned by external stimuli, including heat, light, chemical reagents, and mechanical forces. , Simple luminescent anti-counterfeiting technology, nonetheless, no longer meets the demand for anti-counterfeiting; consequently, new strategies that will show higher security levels are continuously and excessively researched and developed.…”

Topological photonic encoder based on the disclination states

“…In addition, people can use additional encryption algorithms to effectively prevent information leakage, so it is also widely used in secure communication [12][13][14]. In recent years, people have made a series of explorations on the preparation strategies of photonic encoding devices, such as fluorescence technology, light-emitting elements, quantum dots, waveguides, and so on [15][16][17][18][19][20][21][22][23]. Nevertheless, topological photonic encoders based on topological photonic crystals have not been reported.…”

Light and Humidity Dual-Responsive Anti-Counterfeiting Films Based on Hydrogen-Bonded Cholesteric Liquid Crystal Polymers with Spiropyran

“…Li et al’s work combined nonchiral dyes with cholesteric liquid crystals, offering precise control over circularly polarized luminescence (CPL) intensity. Duan et al innovatively merged fluorescent dyes with blue-phase liquid crystals, intensifying the vibrancy of the coating’s colors. Going a step further, Wang et al integrated chiral fluorescence photoswitches as chiral fluorescent switches, enabling adjustments in fluorescent intensity and facilitating repeated information erasure.…”