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Water Soluble Cadmium Selenide Quantum Dots (CdSe/ZnS) 625 nm

Cadmium Selenide/Zinc Sulfide (CdSe/ZnS) core–shell quantum dots, precisely engineered for a 625 ± 10 nm emission, deliver strong 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 high photoluminescence efficiency and long-term stability. These nanocrystals exhibit a narrow FWHM (<28 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 provides superior dispersibility in aqueous systems, enabling seamless integration into biosensing, fluorescence imaging, and advanced photonic platforms. With a balance of optical precision, biocompatibility, and versatile surface functionalization, the 625 nm dots represent 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 625 nm emission enhances sensitivity for detecting proteins, pathogens, and 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.