Multi-site isomerization of synergistically regulated stimuli-responsive AIE materials toward multi-level decryption

Abstract

Stimuli-responsive aggregation-induced emission (AIE) materials are highly sensitive and rapidly responsive to external signals, making them ideal solid materials for anti-counterfeiting encryption. However, the limited conformational and packing variations resulting...

Fabrication of efficient and red-emissive salicylaldehyde Schiff base isomers for multi-scenario information decryption

“…In comparison, the intermolecular interactions of o -TPA-Br are mainly H⋯H interactions, and the packing of p -Br-TPA is denser. 2,37 The above analysis clearly supports the modification strategy with multiple TPA units to provide the appropriate packing mode and transition characteristics of luminogens in the solid state and finally endow them with red emission and high QY.…”

“…In contrast, o , p -2TPA and p , p -2TPA show comparatively high efficiency with absolute QYs of 11.15% and 14.52%, respectively, which are much higher than those of the mono-TPA-substituted compounds ( o -TPA-Br: 0.6% and p -Br-TPA: 0%), as reported in previous work. 2,37 The above results also indicate that the para -substituted position of the phenol group in the salicylaldehyde Schiff base scaffold is more conducive than the ortho -substituted position to produce efficient luminescence.…”

“…This result is consistent with a previous report. 37 In summary, the synergistic effect of the large Stokes shift caused by the ESIPT process and the CT transition in the keto form resulted in red emission from these isomers.…”

“…In previous works, single TPA and bromine groups were utilized to construct stimuli-responsive Schiff base derivatives. 2,37 However, these molecules exhibit two main issues: short emission wavelength and low fluorescence efficiency (Fig. 1a).…”

Unique Fluorescence of Aggregation-Induced Emission Luminogens on Solid Surfaces Modified by Silicone Nanofilaments

“…Unlike conventional organic luminophores that suffer from aggregation-caused quenching, AIEgens exhibit strong fluorescence in the aggregated state and weak emission in dilute solutions . This remarkable characteristic has opened up new possibilities for applications in various fields, including chemo-sensing, , bioimaging, , optoelectronics, , and stimuli-responsive systems. , Research on AIE has led to a deeper understanding of the underlying mechanisms controlling these phenomena, facilitating the rational design of novel AIEgens. − While covalent modifications and noncovalent self-assembly have been widely employed to construct AIE-active species, the majority of these approaches involve complex synthetic procedures, and studies on their photophysical properties are mainly conducted in solution …”