Highly Efficient Aggregation-Induced Room-Temperature Phosphorescence with Extremely Large Stokes Shift Emitted from...

Area of Science:

• Materials Science
• Photochemistry
• Supramolecular Chemistry

Background:

• Aggregation-induced emission (AIE) is a phenomenon where luminescence is enhanced upon aggregation.
• Room-temperature phosphorescence (RTP) in air is challenging due to triplet state quenching.
• Gold(I) complexes are explored for their unique photophysical properties.

Purpose of the Study:

• To report highly efficient aggregation-induced phosphorescence from trinuclear Au(I) complexes.
• To investigate the mechanism behind room-temperature phosphorescence in air.
• To correlate photophysical properties with crystal packing and molecular structure.

Main Methods:

• Synthesis and characterization of trinuclear Au(I) complexes.
• Photoluminescence spectroscopy to measure quantum yield and emission spectra.
• X-ray crystallography to analyze crystal packing and intermolecular interactions.

Main Results:

• Achieved high quantum yield (≈75%) for aggregation-induced phosphorescence.
• Observed room-temperature phosphorescence in air with a large Stokes shift (450 nm).
• Identified dual-mode intermolecular interactions within crystal structures as key to RTP.

Conclusions:

• Trinuclear Au(I) complexes exhibit efficient aggregation-induced room-temperature phosphorescence.
• Dual-mode intermolecular interactions in crystals are crucial for enabling RTP in air.
• The findings offer insights into designing luminescent materials with enhanced stability.