Polymerization Based on Modified β-Cyclodextrin Achieves Efficient Phosphorescence Energy Transfer for...

Area of Science:

• Supramolecular Chemistry
• Materials Science
• Photophysics

Background:

• Supramolecular polymerization can enhance phosphorescence and energy transfer.
• Developing advanced luminescent materials with tunable properties is crucial.

Purpose of the Study:

• To create solid supramolecular assemblies with near-infrared (NIR) luminescence.
• To investigate energy transfer mechanisms and afterglow properties.
• To explore applications in information encryption and anti-counterfeiting.

Main Methods:

• Synthesized ternary copolymers of acrylamide, modified β-cyclodextrin (CD), and carbazole (CZ).
• Doped copolymers with polyvinyl alcohol (PVA) and dyes to form NIR luminescent composites.
• Investigated energy transfer efficiency, luminescence lifetime, and switchable afterglow properties.

Main Results:

• Achieved a NIR luminescence supramolecular composite with a lifetime of 1.07 s and 97.4% energy transfer efficiency via tandem phosphorescence energy transfer.
• Ternary copolymers facilitated macrocyclic enrichment of dyes, enhancing triplet-singlet energy transfer.
• Flexible polymeric films exhibited tunable luminescence color and repeatable switchable afterglow.

Conclusions:

• The developed supramolecular composites demonstrate efficient NIR luminescence and tunable afterglow.
• These materials show promise for advanced applications such as information encryption and anti-counterfeiting.