Co‐Assembly of Biosynthetic Chiral Nematic Adhesive Materials with Dynamic Polarized Luminescence

Abstract

There is currently an extensive demand for simple and effective synthetic methods to allow the design and fabrication of robust and flexible chiral materials that can generate strong and switchable circularly polarized luminescence (CPL). Herein, biosynthetic light‐emitting adhesive materials based upon chiral nematic cellulose nanocrystal–polyelectrolyte complexes with universal high adhesion on both hydrophilic and hydrophobic substrates are reported. Strong and dynamic photoluminescence with highly asymmetric and switchable circular polarization is induced by minute rare earth europium doping without compromising adhesive strength and initial iridescent properties. The photoluminescence can be temporarily quenched with highly volatile acetone vapor and liquid followed by fast recovery after drying with full restoration of initial emission. The unique properties of light‐emitting bio‐adhesives with universal adhesion, amplified and dynamic photoluminescence, and large and switchable CPL can be utilized for security optical coding, bio‐optical memory, hidden communication, and biochemical sensing as wearable stickers, prints, and tattoos to directly adhere to human clothes, gadgets, and skin by using adhesive stickers with bright tailored photoluminescence.

Multimode Anticounterfeiting Labels Based on a Flexible and Water-Resistant NaGdF4Yb3+,Er3+@Carbon Dots Chiral Fluorescent Cellulose Film

“…Counterfeit products also undermine the intellectual property law and will not only cause significant economic losses and social problems − but also severely threaten human health (e.g., fake medicine, harmful food). Based on this, a variety of anticounterfeiting technologies, such as bar codes, , holograms, , fluorescent anticounterfeiting, − and radio frequency identification tags, are emerging one after another. More and more anticounterfeiting materials have been developed to prevent counterfeit products from emerging and entering the market.…”

Multivalued Logic for Optical Computing with Photonically Enabled Chiral Bio-organic Structures

“…It is further confirmed by the presence of the positive peak at the circular dichroism measurement (Figure 2d). 47,48 The UV−vis spectra of CNC, CNC/PEG, and CNC/PEG/NaCl at different RH show a systematic shift in photonic bandgap (Figure 2e−g). The composite CNC/PEG/NaCl layer shows an evident color change from blue (Figure 2e), to yellowish (Figure 2f) and to reddish as RH increases from 25−92% (Figure 2g).…”

Responsive Chiral Photonic Cellulose Nanocrystal Materials

“…Kim et al fabricated highly adhesive soft materials from CNCs, PAA, and europium (Eu), exhibiting strong and tunable CPL. [182] The CNC-PAA-Eu film was completely quenched after swelling in acetone due to the chemically induced dissociation/disruption of the coordination bonds between Eu 3+ and the carboxylate groups in the potassium hydrogen phthalate ligand. Interestingly, when spraying water, the g lum of the film increased from −0.08 to −0.46.…”