Excitation-Dependent Ionogels Based on Lanthanide-Terpyridine Coordination for Dynamic and Controllable Orthogonal...

Area of Science:

• Materials Science
• Chemistry
• Information Security

Background:

• Fluorescent gels offer encryption advantages like high storage and security.
• Current fluorescent gels are limited to static or binary encoding, restricting multistate encryption.
• Developing advanced fluorescent materials is crucial for high-level information security.

Purpose of the Study:

• To synthesize a novel ligand (Tpy-Emim) for creating advanced fluorescent ionogels.
• To develop robust, hydrophobic fluorescent ionogels with multicolor emission properties.
• To engineer a dynamic encryption system utilizing excitation-dependent luminescence and stimuli-responsive fluorescence.

Main Methods:

• Synthesis of terpyridine-vinyl imidazole salt ligand (Tpy-Emim).
• One-step in situ photopolymerization to create fluorescent ionogels (P(ACMO/BA/Tpy)-Ln).
• Tuning multicolor fluorescence by adjusting Eu³⁺/Tb³⁺ ratios and utilizing excitation-dependent luminescence.
• Developing a dynamic encryption system integrating 2D/3D codes and ammonia vapor sensing.

Main Results:

• Novel fluorescent ionogels (P(ACMO/BA/Tpy)-Ln) with mechanical strength, adhesion, and hydrophobicity were successfully fabricated.
• Multicolor fluorescence (red, orange, green, white) was achieved by varying Eu³⁺/Tb³⁺ ratios.
• Excitation-dependent luminescence enabled dynamic color changes, forming the basis for a 2D/3D code encryption system.
• The ionogel's fluorescence quenching upon ammonia exposure allowed for stimuli-responsive decoding.

Conclusions:

• The developed fluorescent ionogels exhibit tunable multicolor emission and excitation-dependent luminescence, suitable for advanced encryption.
• A dynamic encryption system was demonstrated, integrating 2D/3D codes readable under different conditions (natural light, UV, ammonia vapor).
• This research offers valuable insights for creating fluorescence ionogels for dynamic, controllable, and orthogonal information encryption applications.