Reversible stimuli responsive lanthanide-polyoxometalate-based luminescent hydrogel with shape memory and self-healing properties for advanced information security storage

Lanthanide-Polyoxometalate-Based Film with Reversible Photochromism and Luminescent Switching Properties for Erasable Inkless Security Printing

“…42 However, as illustrated in Figure 5, the decay curve of as-prepared Gelatin/(EuW 10 ) 0.025 film exhibited double exponential behavior, implying that two kinds of EuW 10 species existed in the film, the first lifetime τ 1 may be attributed to the EuW 10 species quenched by the formation of hydrogen bonds, and the second lifetime τ 2 may be derived from the Gelatin/(EuW 10 ) 0.025 species by the electrostatic assembly. 30,43 Nevertheless, the triexponential behavior of Gelatin/ (EuW 10 ) 0.025 film occurred after UV irradiation, and a summary of corresponding lifetimes and proportions is shown in Table 1. The third lifetime τ 3 may be attributed to the heteropolyblue of photoreduced EuW 10 species.…”

“…42 However, in comparison with the Gelatin/(EuW 10 ) 0.025 film without adjusting pH, the lifetime and quantum yield of Gelatin/ (EuW 10 ) 0.025 film decreased to 1074.62 μs and 4.7%, respectively; the reason may stem from the formation of hydrogen bonds. 30,43,47 3.3. Erasable Inkless Security Printing.…”

Emulating Ebbinghaus forgetting behavior in a neuromorphic device based on 1D supramolecular nanofibres

“…1,2 In some other devices, the erasing is done thermally, 3,4 sometimes only temporarily with the application of force. 5,6 Also, there are systems that have information encoded in them via thermal or optical treatments, which selferase when cooled. 7 In the above examples, although the stored information can be erased selectively, the action is not truly spontaneous and is mostly abrupt.…”

Self-Healing Luminescent Elastomers with Ultrahigh Mechanical Strength, Superior Toughness, and Stimuli-Responsive Luminescence

“…Lanthanide (Ln 3+ ) complexes are a very important family of luminescent materials, which show intriguing optical properties featuring high quantum yield, large Stokes shift, high color purity, long fluorescence lifetime, and tunable luminescence color in the visible- and NIR-spectral regions owing to the efficient energy transfer from the ligand to the Ln 3+ ions. − Coordination of Ln 3+ ions to the ligand-functionalized polymers (the so-called polymer–ligands) can result in luminescent polymers that possess both the favorable photophysical properties of Ln 3+ complexes and the excellent properties of the polymer such as good transparency, good mechanical strength, flexibility, and ease of processing. , In some cases, the coordination of Ln 3+ ions with the polymer ligands is expected to give birth to luminescent materials with self-healing capacity thanks to the dynamic nature of the coordination bonds, which can autonomously repair physical damage and restore the original functions. , Thereby, the self-healing ability can extend the lifetime, reduce maintenance costs, and avoid waste. For instance, Bao et al reported a self-healing polymer exhibiting high stress at break (≈1.8 MPa) and high fracture strain (≈900%) based on a combination of dynamic Eu 3+ -β-diketone coordination and hydrogen bonds .…”

“…4,5 In some cases, the coordination of Ln 3+ ions with the polymer ligands is expected to give birth to luminescent materials with self-healing capacity thanks to the dynamic nature of the coordination bonds, which can autonomously repair physical damage and restore the original functions. 6,7 Thereby, the selfhealing ability can extend the lifetime, reduce maintenance costs, and avoid waste. For instance, Bao et al reported a selfhealing polymer exhibiting high stress at break (≈1.8 MPa) and high fracture strain (≈900%) based on a combination of dynamic Eu 3+ -β-diketone coordination and hydrogen bonds.…”