Tailoring intermolecular interactions for efficient room-temperature phosphorescence from purely organic materials in...

Area of Science:

• Materials Science
• Organic Chemistry
• Photophysics

Background:

• Room-temperature phosphorescence (RTP) in organic materials is crucial for advanced applications.
• Developing efficient and stable RTP materials remains a significant challenge.
• Controlling intermolecular interactions is key to suppressing non-radiative decay.

Purpose of the Study:

• To design a purely organic material with enhanced room-temperature phosphorescence (RTP).
• To investigate the role of intermolecular interactions in RTP.
• To develop a novel sensing platform for water detection.

Main Methods:

• Rational design of a novel organic phosphor (G1).
• Incorporation of G1 into a poly(vinyl alcohol) (PVA) matrix.
• Characterization of photophysical properties, including quantum yield.
• Investigation of the effect of water molecules on phosphorescence behavior.

Main Results:

• Achieved bright RTP from G1 in PVA with quantum yields up to 24%.
• Demonstrated efficient suppression of vibrational dissipation through strong halogen and hydrogen bonding.
• Observed reversible phosphorescence-to-fluorescence switching triggered by water molecules.
• Established a ratiometric water sensing capability.

Conclusions:

• Tailoring intermolecular interactions is an effective strategy for enhancing RTP in organic materials.
• The G1-PVA system exhibits unique water-responsive luminescence switching.
• The developed material shows promise as a ratiometric water sensor.