Light-Harvesting Supramolecular Phosphors: Highly Efficient Room Temperature Phosphorescence in Solution and...

Area of Science:

• Photophysics
• Supramolecular Chemistry
• Materials Science

Background:

• Solution-phase room-temperature phosphorescence (RTP) in organic materials is challenging.
• Achieving efficient triplet-to-singlet Förster resonance energy transfer (TS-FRET) in solution is rare.
• Organic-inorganic hybrid materials offer unique photophysical properties.

Purpose of the Study:

• To develop a highly efficient solution-state RTP system using organic phosphors.
• To investigate the use of supramolecular scaffolding for enhancing RTP.
• To explore TS-FRET for delayed fluorescence using these hybrid materials.

Main Methods:

• Synthesized a structurally simple phthalimide phosphor.
• Employed an organic-inorganic supramolecular scaffolding strategy.
• Anchored Sulforhodamine acceptor dyes and studied energy transfer mechanisms.

Main Results:

• Achieved high quantum yield RTP (ca. 41.8%) in water, a significant advancement for solution-state phosphorescence.
• Demonstrated efficient TS-FRET from the hybrid scaffold to acceptor dyes, leading to delayed fluorescence.
• Formed self-standing hydrogels with efficient RTP and long-lived fluorescence via electrostatic cross-linking.

Conclusions:

• Supramolecular scaffolding is an effective strategy for realizing high-performance solution-state RTP.
• The developed hybrid materials can act as efficient light-harvesting scaffolds for TS-FRET and delayed fluorescence.
• The formation of hydrogels opens possibilities for advanced functional materials with tunable photophysical properties.