Simple Strategy for Scalable Preparation Carbon Dots: RTP, Time-Dependent Fluorescence, and NIR Behaviors

Area of Science:

• Nanoscience
• Materials Science
• Supramolecular Chemistry

Background:

• Developing smart fluorescent materials from carbon dots (CDs) with tunable properties is crucial for advanced applications.
• Real-time visual monitoring of environmental changes using CDs remains a significant challenge in nanoscience.
• Existing fluorescent materials often rely on aggregation-induced emission or quenching, limiting dynamic responses.

Purpose of the Study:

• To design and synthesize novel carbon dots (CDs) with controllable fluorescence and phosphorescence properties.
• To explore a facile, environmentally friendly, and cost-effective strategy for creating functional CDs.
• To investigate a unique dispersion-induced redshift fluorescence phenomenon in engineered CDs.

Main Methods:

• A one-step, solvent-free, catalytic assistant strategy was employed for CD synthesis.
• Hydrogen bonding was utilized to precisely control the nanostructure and properties of the carbon dots.
• Characterization of photophysical properties, including room-temperature phosphorescence, time-dependent fluorescence, and near-infrared emission.

Main Results:

• Synthesized M-CDs exhibiting matrix-free room-temperature phosphorescence and time-dependent fluorescence.
• Observed an unprecedented dispersion-induced redshift fluorescence phenomenon, distinct from traditional aggregation effects.
• Demonstrated near-infrared emissive characteristics and detailed analysis of the redshift mechanism.

Conclusions:

• The developed strategy offers a low-cost, high-throughput, and eco-friendly route to functional carbon dots.
• The novel M-CDs exhibit unique dynamic fluorescence responses tied to their dispersion state, advancing fluorescence studies.
• These intelligent fluorescent materials hold promise for applications in solid-state lighting, anti-counterfeiting, and cellular imaging.