CdTe/CdS quantum dot customization

Product Name Name:CdTe/CdS quantum dot customization Product Overview Quantum dots (QDs) are a type of inorganic semiconductor nanomaterial that has been increasingly studied in recent years. The semiconductor quantum dots that have been extensively studied are zero dimensional nanocrystalline materials based on three series: II-VI (such as CdSe, ZnS), III-V (such as GaAs, InP), and IV-VI (such as PbS, PbSe). When the diameter of semiconductor crystal particles is smaller than or equivalent to the exciton Bohr radius of the semiconductor bulk material, their electronic energy levels change from quasi continuous to discrete, and the crystal particles are in a quantum confined state. The bandgap of quantum dots changes with grain size, known as the quantum size effect. As the particle size decreases, the effective bandgap of semiconductor quantum dots increases, and their corresponding absorption and fluorescence spectra undergo a blue shift. The properties of a single semiconductor quantum dot strongly depend on its environment, and the strong surface forces and concentration gradients can easily cause ligand loss, leading to photo induced oxidation, erosion, and dissolution of nanocrystals. Therefore, surface passivation is needed to enhance its stability and improve its fluorescence quantum yield. Therefore, after producing a single quantum dot, another wide bandgap semiconductor material can be grown on the surface orientation to obtain composite quantum dots with core-shell structure, which can greatly improve the fluorescence quantum yield and photo oxidation stability. Technical Parameter Excitation wavelength range: 365-420nm Fluorescence emission wavelength range: 520-650nm Concentration: 3mg/ml Solvent: Water Product Features High fluorescence quantum yield: The core-shell structure can significantly improve the fluorescence quantum yield of quantum dots by introducing a protective shell layer. For example, the ZnS shell can effectively reduce the quenching phenomenon caused by surface defects, thereby improving the overall fluorescence efficiency. Adjustable luminescent properties: The size of the core material can be controlled through synthesis conditions to achieve luminescent properties at different wavelengths. For example, CdSe cores can adjust their emission wavelength to meet specific application requirements. Excellent photostability: Due to the protective effect of the shell layer, core-shell structured quantum dots exhibit higher photostability under light and high temperature conditions, making them important for applications in biological labeling and fiber optic sensing. Carrier confinement effect: Electrons and holes in the core-shell structure are confined to different energy bands. This charge confinement effect can enhance the optoelectronic performance of quantum dots and help improve the response speed and sensitivity of the device. Application Fields Solar cells: Quantum dots with core-shell structure exhibit excellent performance in solar cells due to their high light absorption rate and long carrier lifetime, which can significantly improve the photoelectric conversion efficiency of the cell. Optoelectronic devices: Due to their excellent optoelectronic performance and fast response time, core-shell structured quantum dots are widely used in optoelectronic devices such as LEDs, lasers, and photodetectors. Biomarkers and Imaging: Quantum dots with core-shell structures have important applications as bioluminescence probes in cell imaging and in vivo imaging comparisons. Compared with traditional organic dyes, they have higher optical stability and lower toxicity. Fiber optic sensing: Core shell structured quantum dots have also shown great potential in the field of fiber optic sensing, with their high sensitivity and stability making them suitable for various sensing applications. Related Information Note: The excitation, emission wavelength, and surface ligands of semiconductor quantum dots can be customized according to requirements, such as amino and carboxyl groups (such as mercaptoacetic acid and mercaptoacetic acid). Please e-mail for the detailed characterization data. E-mail:sales@xfnano.com