Carbon Quantum Dots (CQDs), 590–620 nm
Solvent: Ethanol, Concentration: 0.1 mg/ml
Carbon Quantum Dots (CQDs) emitting in the 590–620 nm range produce vivid orange photoluminescence, originating from quantum-confined sp² domains decorated with surface states rich in carboxyl, hydroxyl, and amino groups. These functional groups tune the band-gap to ≈2.1 eV and provide excellent dispersibility in polar solvents, pH-dependent fluorescence, and facile chemical conjugation. Synthesized via green, low-temperature methods such as hydrothermal carbonization of citric acid or microwave pyrolysis of biomass, these orange CQDs exhibit photostability, low cytotoxicity, and quantum yields exceeding 30 % after heteroatom (N, S) doping or surface passivation. Their strong down-converted emission under broad excitation makes them ideal for multiplexed bioimaging and fluorescent probes, while their warm emission coordinates suit plant-growth lighting, OLED down-conversion layers, and orange micro-LED inks. Overall, 590–620 nm CQDs offer eco-friendly composition, tunable optics, and versatile chemistry, making them a scalable, cost-effective alternative to heavy-metal quantum dots for next-generation optoelectronic, biomedical, and analytical technologies.
Technical Properties of Carbon Quantum Dots
| Diameter | <15 nm |
|---|---|
| Morphology | Spherical |
| Emission Wavelength Range | 590–620 nm |
| Color | Orange |
| Solvent | Ethanol |
| Concentration | 0.1 mg/ml |
Standard Analyses Provided
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Excitation and Emission wavelength using PL Spectrophotometer
Additional Analyses (Extra Fee)
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Particle Size Distribution
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Quantum Yield
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Fluorescence Lifetime
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TEM Imaging
Applications of Carbon Quantum Dots
Carbon Quantum Dots (CQDs) are widely applied across industries due to their strong photoluminescence, eco-friendly composition, and versatile surface chemistry. Key application areas include:
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Biomedical Applications: CQDs are extensively used in bioimaging, biosensing, and drug delivery due to their excellent solubility in polar solvents, low cytotoxicity, and surface functionalization. Their pH-dependent fluorescence and biocompatibility make them ideal for real-time cellular imaging and diagnostic platforms.
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Optoelectronics and Displays: CQDs act as efficient down-conversion materials in LEDs, particularly for warm-color emission in display technologies. Their broad excitation range and stable luminescence make them suitable for OLEDs, micro-LEDs, and photodetectors.
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Sensing Technologies: High sensitivity and selective surface interactions allow CQDs to detect metal ions, biomolecules, and environmental toxins. Fluorescence quenching or enhancement under specific analyte interaction provides rapid and precise detection.
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Plant Growth and Agricultural Applications: Orange-emitting CQDs match the photosynthetically active radiation (PAR) range, useful in agricultural lighting systems. They are also explored for controlled-release fertilizers, smart sensors, and plant health monitoring.
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Environmental and Energy Applications: CQDs contribute to photocatalysis, pollutant degradation, and water treatment via stable redox properties. In energy conversion, they are studied for roles in solar cells and energy-harvesting devices as light absorbers or charge transport enhancers.
