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Synthesis of Carbon Dots with Multiple Color Emission by Controlled Graphitization and Surface Functionalization
Xiang Miao1,2,3, Dan Qu1, Dongxue Yang1
1Beijing Key Lab for Green Catalysis and Separation, Department of Chemistry and Chemical Engineering, College of Environmental and Energy Engineering, Beijing University of Technology, 100 Pingleyuan, Beijing, 100124, P. R. China.
Researchers developed multi-color emissive carbon dots (CDots) by controlling graphitization and surface functionalization. These tunable CDots offer a low-cost alternative for advanced light-emitting devices and bioimaging applications.
Area of Science:
- Materials Science
- Nanotechnology
- Photochemistry
Background:
- Carbon dots (CDots) are promising nanomaterials for applications in bioimaging, light-emitting devices, and photocatalysis.
- Current CDots often exhibit excitation-wavelength-dependent emissions, with maximum emission typically limited to the blue-light region.
- There is a need for CDots with tunable emission across the visible spectrum for broader applications.
Purpose of the Study:
- To synthesize multiple-color-emissive carbon dots (CDots) with tunable emission properties.
- To investigate the effect of controlled graphitization and surface functionalization on CDot emission.
- To demonstrate the potential of these CDots in fabricating multi-color and white-light-emitting devices.
Main Methods:
- CDots were synthesized via controlled thermal pyrolysis of citric acid and urea.
- Emission color was tuned by regulating pyrolysis temperature and reactant ratios, controlling graphitization and surface functional groups (e.g., -COOH).
- CDots were incorporated into epoxy resins to create transparent composite materials.
Main Results:
- Synthesized CDots exhibited tunable emission from blue (430 nm) to red (630 nm) by controlling graphitization and surface functional groups.
- Photoluminescence quantum yields reached up to 52.6% (blue), 35.1% (green), and 12.9% (red).
- Transparent CDot/epoxy composites were successfully fabricated for multi-color and white-light emission.
Conclusions:
- Controlled graphitization and surface functionalization enable the synthesis of CDots with tunable, broad-spectrum emission.
- These CDots serve as effective phosphors for developing low-cost, multi-color, and white-light-emitting devices.
- The developed CDots show significant potential for advancing display and lighting technologies.
