Nonclassical Hydrogen Bond-Based Efficient Solid-State Organic Emitters Enabled by a Synergistic Anion and Mechanical...

Area of Science:

• Supramolecular Chemistry
• Materials Science
• Photophysics

Background:

• Traditional fluorophores suffer from aggregation-caused quenching (ACQ), limiting their use in concentrated systems.
• Developing novel fluorescent materials with high intensity and quantum yield is crucial for advanced applications.

Purpose of the Study:

• To investigate the synergistic effect of anions and mechanical bonds on fluorescence properties.
• To overcome the limitations of aggregation-caused quenching in fluorescent materials.

Main Methods:

• Synthesis of rotaxane-based fluorescent materials.
• Spectroscopic analysis to determine fluorescence intensity and quantum yield.
• Crystallographic studies to elucidate structural properties and intermolecular interactions.

Main Results:

• Achieved up to a 14-fold increase in fluorescence intensity.
• Obtained a high quantum yield of 97.0%.
• Identified nonclassical hydrogen bonds as key to stabilizing structure and restricting motion.

Conclusions:

• The combined effect of anions and mechanical bonds effectively suppresses ACQ.
• This approach enables high-performance fluorescence and opens doors for applications in circularly polarized luminescence (CPL) and stimuli-responsive materials.