Cadmium Selenide Quantum Dots (CdSe/ZnS QD) 645 nm

Cadmium Selenide/Zinc Sulfide (CdSe/ZnS) Core-Shell Quantum Dots, optimized for a precision emission at 645 nm, represent the pinnacle of high-performance semiconductor nanotechnology. These nanocrystals feature a high-quality CdSe core encapsulated within an epitaxial ZnS shell, which effectively passivates surface states to achieve near-unity quantum yields and exceptional photostability against bleaching. The 645 nm peak provides a deep, saturated red fluorescence characterized by a remarkably narrow FWHM (Full Width at Half Maximum), ensuring unparalleled spectral purity. Engineered for versatility, these quantum dots exhibit high molar extinction coefficients and robust chemical stability, making them the ideal choice for applications requiring intense, reliable light emission and efficient charge carrier dynamics in both biological and optoelectronic systems.

Technical Properties

Applications

• Advanced Display Devices & QLEDs: Functions as a high-purity red emitter in next-generation displays, enabling the achievement of wide color gamuts and high-contrast visuals.
• Deep-Tissue Bioimaging: Utilized as a bright fluorescent probe in biological research; the 645 nm emission falls within a range of reduced tissue autofluorescence, allowing for deeper light penetration and clearer imaging.
• High-Efficiency Solar Cells: Integrated into quantum dot sensitized solar cells (QDSSCs) and luminescent solar concentrators to enhance light harvesting and energy conversion efficiency through spectral shifting.
• Optical & Chemical Sensors: Serves as a sensitive signaling element in detection platforms where fluorescence quenching or FRET (Fluorescence Resonance Energy Transfer) is used to identify trace analytes.
• Solid-State Lighting: Applied in the development of specialized LEDs and laser diodes that require stable, monochromatic red light with high luminous efficacy.
• Quantum Computing & Electronics: Employed in the fabrication of single-electron transistors and photonic circuits, leveraging the discrete energy levels provided by quantum confinement.