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Taming Light with Carbon Dots
Arun M1, Karthikeyan Alagarsamy1, T C Sabri Girisun2
1Quantum Materials Research Lab (QMRL), Department of Nanoscience and Technology, Alagappa University, Karaikudi, 630 003, Tamil Nadu, India.
Journal of Fluorescence
|February 3, 2026
Summary
Researchers developed novel dual-photon emissive carbon dots from biomass for optical limiting applications. These eco-friendly carbon dots offer broad spectral coverage and efficient light quenching for laser protection.
Area of Science:
- Materials Science
- Optoelectronics
- Nanotechnology
Background:
- High-power lasers necessitate effective light-quenching materials for eye and sensor protection.
- Existing carbon dots have limitations in spectral range detection.
- Developing cost-effective and versatile light-manipulating materials is crucial.
Purpose of the Study:
- To report a novel dual-photon emissive carbon dot with broad spectral emission coverage.
- To present an effortless and rapid fabrication strategy for these carbon dots.
- To explore their potential for optical limiting applications.
Main Methods:
- Fabrication of dual-color emissive carbon dots (MCCD) from biomass in a single solvent using microwave treatment.
- Characterization using fluorescence spectroscopy and Transmission Electron Microscopy (TEM).
- Evaluation of non-linear optical properties using Z-scan technique.
Main Results:
- Successfully synthesized dual-color emissive carbon dots (MCCD) with excitation-independent behavior.
- TEM analysis revealed an average granule size of 16.93 nm, with a turbostratic carbon structure.
- Z-scan measurements demonstrated significant optical limiting behavior with excited state absorption and two-photon absorption, showing thresholds of 0.53 × 10-10 and 4.54 × 1012 W/m2.
Conclusions:
- The developed MCCD exhibit broad spectral emission and efficient optical limiting properties.
- The eco-friendly and cost-effective fabrication method makes them suitable for various optoelectronic applications.
- These carbon dots present a promising avenue for laser protection and optical limiting devices.
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