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Na+-functionalized carbon dots with aggregation-induced and enhanced cyan emission
Yingfang Tao1, Jie Lin1, Deyin Wang1
1National and Local Joint Engineering Laboratory of Light-conversion Materials and Technology & Key Laboratory for Special Function Materials and Structural Design of the Ministry of Education, Lanzhou University, Lanzhou 730000, China.
Journal of Colloid and Interface Science
|January 11, 2021
Summary
Researchers developed novel carbon dots exhibiting distinct blue and cyan emissions in aqueous and solid states, respectively. Surface functionalization with Na+ enhances their solid-state luminescence, enabling anti-counterfeiting applications.
Area of Science:
- Materials Science
- Nanotechnology
- Photochemistry
Background:
- Carbon dots (CDs) are fluorescent nanomaterials with diverse applications.
- Controlling the solid-state luminescence of carbon dots remains a challenge.
- Understanding aggregation-induced emission changes is crucial for material design.
Purpose of the Study:
- To synthesize novel carbon dots with tunable emission properties.
- To investigate the mechanism behind emission changes in solid-state carbon dots.
- To explore the application of these carbon dots in anti-counterfeiting technologies.
Main Methods:
- Simple hydrothermal synthesis of carbon dots.
- Photoluminescence spectroscopy (steady-state and time-resolved) to analyze emission properties.
- Surface functionalization with Na+ to enhance luminescence.
Main Results:
- Synthesized carbon dots emit blue in aqueous and cyan in solid states.
- Solid-state photoluminescence quantum yield significantly increased to 29.2% due to aggregation-induced surface state changes.
- Na+ functionalization improved solid-state luminescence and resistance to quenching.
- Demonstrated proof-of-concept for anti-counterfeiting inks and fluorescent imaging.
Conclusions:
- A facile hydrothermal method yields carbon dots with state-dependent luminescence.
- Aggregation-induced surface state changes enhance solid-state emission.
- Surface functionalization is key to optimizing solid-state performance.
- These carbon dots show promise for advanced anti-counterfeiting and imaging applications.
