Carbon Quantum Dots (CQDs), 590–620 nm, Solvent: DI Water, Concentration: 0.01 mg/ml
Carbon Quantum Dots (CQDs) emitting in the 590–620 nm range produce a strong orange photoluminescence derived from quantum-confined sp² domains with surface groups such as carboxyl, hydroxyl, and amino functionalities. These groups tune the band-gap to ≈2.1 eV while providing excellent water dispersibility, pH-dependent fluorescence, and straightforward chemical conjugation. Synthesized through green, low-temperature routes—including hydrothermal carbonization of citric acid or microwave pyrolysis of biomass—orange CQDs offer photostability, low cytotoxicity, and quantum yields that can exceed 30% with hetero-atom (N, S) doping or surface passivation. Their strong down-converted emission under broad excitation supports use in multiplexed bioimaging and fluorescent probes, while their warm color coordinates align with requirements for plant-growth lighting, OLED down-conversion layers, and orange micro-LED inks. Overall, 590–620 nm CQDs combine eco-friendly composition, tunable optical behavior, and versatile chemistry, making them a scalable and cost-effective alternative to heavy-metal quantum dots for future 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 | DI Water |
| Concentration | 0.01 mg/ml |
Analysis We Provide as Standard
Excitation and emission wavelength with PL spectrophotometer
Other Extra Analyses We Can Provide (extra fee required)
Particle size distribution
Quantum yield
Fluorescence lifetime
Applications of Carbon Quantum Dots
Carbon Quantum Dots (CQDs) have broad use across multiple sectors due to their strong photoluminescence, eco-friendly composition, and adaptable surface chemistry. Key application areas include:
Biomedical Applications: CQDs are used in bioimaging, biosensing, and drug delivery thanks to their excellent water solubility, low cytotoxicity, and ability to be readily functionalized. Their pH-dependent fluorescence and biocompatibility make them suitable for real-time cellular imaging and diagnostic systems.
Optoelectronics and Displays: CQDs function as efficient down-conversion materials in LEDs, especially for warm-color emission in display devices. Their broad excitation range and stable luminescence enable integration into OLEDs, micro-LEDs, and photodetectors.
Sensing Technologies: With strong sensitivity and selective surface interactions, CQDs are incorporated into chemical and biological sensors to detect metal ions, biomolecules, and environmental toxins. Their fluorescence quenching or enhancement enables rapid and accurate detection.
Plant Growth and Agricultural Applications: Orange-emitting CQDs align with the photosynthetically active radiation (PAR) range, supporting their use in agricultural lighting. They are also evaluated for controlled-release fertilizers, smart sensors, and plant-health monitoring.
Environmental and Energy Applications: CQDs contribute to photocatalysis, pollutant degradation, and water treatment due to their stable redox behavior. In energy conversion, they are investigated for roles in solar cells and energy-harvesting devices as light absorbers or charge-transfer enhancers.
