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Water Soluble Cadmium Selenide Quantum Dots (CdSe/ZnS) 645 nm

Cadmium Selenide/Zinc Sulfide (CdSe/ZnS) core–shell quantum dots, precisely tuned for a 645 ± 10 nm emission, deliver high-performance fluorescence in the red spectral region. The CdSe core is epitaxially passivated with a ZnS shell, effectively reducing surface defects and suppressing non-radiative recombination, which ensures strong photoluminescence efficiency and enhanced photostability. These nanocrystals exhibit a narrow FWHM (<30 nm) and excellent quantum yields (>70% with MPA/CA/GSH ligands, >60% with PEG-COOH/PEG-NH2 ligands), producing bright, spectrally pure signals with minimal overlap. Their water-soluble ligand chemistry guarantees excellent dispersibility in aqueous systems, enabling seamless integration into biosensing, fluorescence imaging, and advanced photonic platforms. The combination of optical precision, biocompatibility, and versatile functionalization positions the 645 nm dots as a reliable material for both research and industrial applications.

Technical Properties

Configurable Parameters

Applications

• Multiplexed Bioimaging: Strong red emission supports multi-color imaging in biological systems, allowing simultaneous visualization of diverse cellular targets.
• Biosensing & Diagnostics: Incorporated into immunoassays and FRET-based biosensors, the 645 nm emission enhances sensitivity for detecting proteins, pathogens, and disease biomarkers.
• Fluorescence-Guided Drug Delivery: Functionalized with biocompatible ligands to track therapeutic carriers in vivo, enabling precise monitoring of drug distribution pathways.
• Environmental Monitoring: Applied in aqueous sensing systems for heavy metal ion and pollutant detection, leveraging fluorescence quenching/enhancement for sensitive readouts.
• Photocatalysis & Energy Research: Utilized in solar energy conversion and photocatalytic water-splitting, benefiting from efficient charge transfer in aqueous environments.
• Biomedical Applications: Suitable for theranostic platforms combining imaging and therapy, thanks to strong red emission and biocompatibility.