Visualizing Material Processing via Photoexcitation-Controlled Organic-Phase Aggregation-Induced Emission.

Area of Science:

• Materials Science
• Organic Chemistry
• Photophysics

Background:

• Aggregation-induced emission (AIE) is crucial for visualizing material aggregation and self-assembly.
• Current AIE methods often require water for aggregate preparation, limiting material processing options.

Purpose of the Study:

• To achieve AIE in pure organic phases, overcoming the limitations of water-dependent methods.
• To develop a nonequilibrium strategy for controlled aggregation and luminescence enhancement in organic solvents.

Main Methods:

• Utilized hexathiobenzene-based small molecules, monopolymers, and block copolymers as material prototypes.
• Applied a photoexcitation-controlled aggregation strategy, inducing dynamic conformational changes upon irradiation.
• Investigated AIE in pure organic phases without the need for water.

Main Results:

• Achieved significant aggregation-induced emission in organic solvents, with up to a 200-fold increase in luminescent quantum yield.
• Demonstrated a nonequilibrium strategy enabling photo-induced conformational changes and continuous aggregation-dependent luminescence enhancement.
• Developed photoconvertible self-assemblies with steady-state characteristics suitable for organic solvent processing.

Conclusions:

• The photoexcitation-controlled aggregation strategy successfully enables AIE in pure organic phases.
• This approach allows for visual monitoring of solution-to-film transitions and in situ photoprocessing of solid-state materials.
• The findings open new avenues for material processing and applications utilizing AIE in organic environments.