Carbon Quantum Dots (CQDs), Size: 590-620 nm, Solvent: Ethanol

25 ml: 45€
50 ml: 77€
100 ml: 120€

Contact us for tailored quotes on larger quantities & experience exceptional solutions from our experts.

Carbon Quantum Dots (CQDs), Size: 590-620 nm, Solvent: Ethanol

Carbon Quantum Dots (CQDs) that emit in the 590–620 nm range provide a vivid orange photoluminescence arising from quantum-confined sp² domains decorated with surface states rich in carboxyl, hydroxyl, and amino groups; these functional moieties not only tune the band-gap to ≈2.1 eV but also endow the dots with excellent water dispersibility, pH-dependent fluorescence, and facile chemical conjugation. Synthesized through green, low-temperature routes such as hydrothermal carbonization of citric acid or microwave pyrolysis of biomass, orange CQDs exhibit photostability, low cytotoxicity, and quantum yields that can surpass 30 % after hetero-atom (N, S) doping or surface passivation. Their intense down-converted emission under wide excitation makes them attractive for multiplexed bioimaging and fluorescent probes, while the warm color coordinates align well with the spectral needs of plant-growth lighting, OLED down-conversion layers, and orange micro-LED inks. Altogether, 590–620 nm CQDs combine eco-friendly composition, tunable optics, and versatile chemistry, positioning them as a scalable, cost-effective alternative to heavy-metal quantum dots for next-generation optoelectronic, biomedical, and analytical technologies.

Technical Properties of Carbon Quantum Dots

Analyzes we provide as standard:

• Excitation and Emission wavelength with PL Spectrophotometer

Other Extra Analyzes we can provide (extra fee must be paid for these analyzes)

• Particle Size Distribution
• Quantum Yield
• Fluorescence Lifetime

Carbon Quantum Dots (CQDs) TEM Images

Applications of Carbon Quantum Dots

Carbon Quantum Dots (CQDs) are widely used across various industries owing to their strong photoluminescence, eco-friendly composition, and versatile surface chemistry. Key application areas include:

• Biomedical Applications: CQDs are extensively used in bioimaging, biosensing, and drug delivery due to their excellent water solubility, low cytotoxicity, and surface functionalization capacity. Their pH-dependent fluorescence and biocompatibility make them ideal for real-time cellular imaging and diagnostic platforms.
• Optoelectronics and Displays: CQDs serve as efficient down-conversion materials in light-emitting diodes (LEDs), particularly for warm-color emission in display technologies. Their broad excitation range and stable luminescence support their integration into OLEDs, micro-LEDs, and photodetectors.
• Sensing Technologies: With high sensitivity and selective surface interaction, CQDs are utilized in chemical and biological sensors to detect metal ions, biomolecules, and environmental toxins. Their fluorescence quenching or enhancement under specific analyte interactions provides rapid and precise detection.
• Plant Growth and Agricultural Applications: Orange-emitting CQDs match the photosynthetically active radiation (PAR) range, making them useful in agricultural lighting systems. They are also explored for use in 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 properties. In energy conversion, they are studied for roles in solar cells and energy-harvesting devices as light absorbers or charge transport enhancers.