Lighting Up the Non-conjugated Polymers in Full Color via Domino-Effect Triggered Emission

Area of Science:

• Polymer Chemistry
• Materials Science
• Supramolecular Chemistry

Background:

• Non-conjugated polymers typically exhibit limited light absorption and are non-emissive due to wide energy gaps.
• Activating these polymers for tunable emissions is crucial for applications in diagnostics, data protection, and imaging.
• Existing methods often involve harsh conditions, produce by-products, and compromise polymer structural integrity.

Purpose of the Study:

• To develop a method for activating non-emissive polymers to exhibit tunable and amplified fluorescence.
• To create a supramolecular system that enhances polymer emission properties without altering the polymer backbone.
• To explore the potential of this new approach for applications in sensing, imaging, and data protection.

Main Methods:

• Constructed a supramolecular domino system statistically comprising a fluorophore (trigger) and non-emissive polymer chains (dominoes).
• Utilized through-space conjugation of pendant unsaturated repeating units in polymer chains to narrow the molecular energy gap.
• Introduced trace amounts of fluorophores to induce charge transfer and generate amplified, redshifted emissions.

Main Results:

• Achieved "light-up" of non-emissive polymers through a supramolecular domino effect.
• Observed amplified and redshifted emissions resulting from fluorophore-polymer charge transfer, with emission intensity correlating with polymer concentration.
• Demonstrated tunable emission wavelengths by altering fluorophore structure, polymer molecular weight, and chemical composition.

Conclusions:

• The supramolecular domino strategy effectively activates non-conjugated polymers for fluorescence.
• This scalable and cost-effective method offers tunable emissions and amplified signals, mimicking a domino chain reaction.
• The developed fluorescent materials show significant potential for advanced applications in imaging, sensing, and data protection.