ZnCdS/ZnS Quantum Dots
Product Description
Alfa Chemistry offers ZnCdS/ZnS quantum dot products, which are core/shell fluorescent nanomaterials with ZnCdS as the core and ZnS as the shell layer, and the surface is wrapped by PEG groups, which should be stored away from direct sunlight and kept in a sealed dark place at 4 degrees. The product has the characteristics of uniform particle size, broad absorption spectrum, symmetric emission spectrum, high and stable fluorescence intensity. It is especially suitable for the blue light component of quantum dot light emitting diodes (QLED), and also for solar cells and biofluorescent labeling.
Features
Uniform particle size
Biocompatibility
High and stable fluorescence intensity
High quantum field
Applications
Photocatalysts
Hao et al. constructed in situ S-scheme ZnCdS/ZnS composites mediated by ZnCdS/MOF-5-derived zinc vacancies via a sacrificial reagent in aqueous Na2S/Na2SO3 solution under visible light irradiation. ZnS-VZn has two-photon absorption properties, which greatly enhances the absorption of visible light by the photocatalyst. ZnS-VZn on photoelectrons generated on the Zn hole defect will recombine with holes in the valence band (VB) of ZnCdS through the ohmic contact caused by the Zn hole defect. Thus, the photoexcitons of ZnCdS can effectively separate and eliminate the unwanted electrons and holes.The ZnCdS/ZnS samples showed excellent photocatalytic hydrogen production rate and turnover number (TON), which were 82.06 and 21.98 times higher than those of pure ZnS-VZn and ZnCdS, respectively.
Fluorescence Sensors
Yang et al. reported a ternary QDs-based MIP ratiometric fluorescence sensor for the quantitative determination of ascorbic acid (AA). The system was constructed to perfectly combine the advantages of ternary QDs with composition-dependent optical properties and good stability with the high selectivity of MIP. At a single excitation wavelength of 380 nm, the sensor possesses two high-resolution emission peaks at 530 and 705 nm corresponding to the emission of ZnCdS QDs@MIP and CdTeS QDs@SiO2, respectively. The ZnCdS QDs are encapsulated in the MIP as the response signal, while the CdTeS QDs are embedded in the SiO2 shell as the reference signal, which improves the accuracy of the measurement results. In addition, the presence of specific recognition sites on the surface of ZnCdS QDs@MIP improves the sensitivity and selectivity of the detection.
Fig.1 Schematic illustrations of ZnCdS QDs@MIP/CdTeS QDs@SiO2 sensor for the recognition of AA. (Yang et al., 2021)
Light-emitting Diodes
Shen et al. reported efficient blue-violet quantum dot light-emitting diodes (QD-LEDs) by using high-quantum-yield ZnCdS/ZnS graded core-shell QDs with appropriate surface ligands. Replacement of the oleic acid ligand on the synthesized QDs with a shorter 1-octanethiol ligand resulted in a 2-fold increase in electron mobility within the QD films. Such a ligand exchange also leads to a greater increase in the holes injected into the QD layer, which improves the overall charge balance in the LED and results in a 70% increase in quantum efficiency.
Fig.2 (a) TEM image of ZnCdS/ZnS core-shell QDs (scale bar: 100 nm). (b) Absorption and PL emission spectra of the ZnCdS/ZnS QDs. (Shen et al., 2015)
Alfa Chemistry can provide a variety of complex and customized fluorescent quantum dot products. Our products involve perovskites precursors, perovskites quantum dots, quantum dot kit, single layer quantum dots, upconverting nanoparticles and other fluorescent quantum dots. Alfa Chemistry provides products with high fluorescence quantum yield, stable quality and relatively low price. Our products are constantly updated. If the product you need is not in our catalog, please feel free to contact us, we provide relevant custom services.
References
- Hao, X. , et al.Zn-Vacancy Engineered S-Scheme ZnCdS/ZnS Photocatalyst for Highly Efficient Photocatalytic H2 Evolution[J]. ChemCatChem, 2021, 13.
- Yang, M. , et al. A novel ascorbic acid ratiometric fluorescent sensor based on ZnCdS quantum dots embedded molecularly imprinted polymer and silica-coated CdTeS quantum dots[J]. Journal of Molecular Liquids, 2021, 337(26):116438.
- Shen, Huaibin, et al. High-efficiency, low turn-on voltage blue-violet quantum-dot-based light-emitting diodes. Nano letters, 2015, 15(2): 1211-1216.
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