Oil Soluble CdZnS/ZnS Quantum Dots
Product Description
Alfa Chemistry offers oil soluble CdZnS/ZnS core/shell quantum dots in the emission range of 445 nm to 615 nm. Alfa Chemistry offers quantum dots with strong lattice strength and stable performance. The internal pressure caused by the lattice defects of the quantum dots is effectively reduced, so the quantum dots have high luminescence efficiency and stability. Our oil soluble CdZnS/ZnS quantum dots can be used for high sensitivity cell imaging, photovoltaic devices, solar cells and light emitting devices.
Applications
Silicon Solar Cells
The spectral response of silicon in silicon solar cells is in the ultraviolet region, and progress made in overcoming the effect of underutilization of energy collected in silicon solar cells by modifying the input spectrum would greatly improve the power conversion efficiency (PCE). Mfaab et al. prepared highly luminescent CdZnS/ZnS quantum dots (QDs) for application as downshifted materials in nanostructured silicon. The applied QDs show a major potential to transfer high energy from the UV region to low energy and then to the underlying silicon nanostructure by radiative and non-radiative energy transfer. This energy transfer significantly improves the cell efficiency from 10.4% to 13.5%, indicating that this approach is a reliable solution for improving solar cell performance.
Fig.1 Schematic diagram of silicon solar cell. (Mfaab et al., 2021)
Liquid Lasers
Yue et al. achieved a blue (~440 nm) liquid laser with ultra-low threshold by designing an unconventional ternary CdZnS/ZnS alloy core/shell QD, through which quasi-continuous wave pumping can be achieved. Such an achievement was achieved by using a novel gain medium with minimal defects, suppressed Auger recombination, and a large gain cross section in combination with a whispering gallery mode resonator with high quality coefficients.
Fig.2 Schematic diagram of CdZnS/ZnS quantum dot solution liquid laser. (Yue et al., 2014)
Blue Light Devices
Lee et al. reported the synthesis of highly efficient, purely colored blue CdZnS/ZnS quantum dots (QDs) and their excellent fluorescence stability under degradable environmental conditions. The CdZnS/ZnS quantum dots are finely emission tunable in the 440-461 nm range and exhibit high photoluminescence quantum yields (QYs) of 81-92%, along with an ultra-narrow spectral 19 nm band width. These QDs were subjected to various post-treatments, including thorough purification cycles, prolonged UV irradiation and hydrophobic to hydrophilic ligand exchange, each of which was generally detrimental to the fluorescence of the QDs. Therefore, no significant deterioration in fluorescence properties was observed, indicating that CdZnS/ZnS QDs are insensitive to the degradable processes described above.
Fig. 3 Absorption and normalized PL spectra of (a) CdZnS QDs prepared by injecting different S-ODE amounts of 2.0, 2.4, and 2.8 ml and (b) the respective CdZnS/ZnS QDs synthesized with the identical shelling reaction. (Lee et al., 2014)
Alfa Chemistry can provide a variety of complex and customized core-shell fluorescent quantum dot products. Our products involve a variety of fluorescent quantum dot products. 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
- Mfaab, C , et al. Energy Management in Hybrid Organic-Silicon Nanostructured Solar Cells by Downshifting using CdZnS/ZnS and CdZnSe/ZnS Quantum Dots-ScienceDirect[J]. Nano Energy, 2021.
- Yue, et al. Blue Liquid Lasers from Solution of CdZnS/ZnS Ternary Alloy Quantum Dots with Quasi-Continuous Pumping[J]. Advanced Materials, 2014.
- Lee, K. H. , et al. Highly fluorescence-stable blue CdZnS/ZnS quantum dots against degradable environmental conditions[J]. Journal of Alloys & Compounds, 2014, 610:511-516.
* It should be noted that our service is only used for research, not for clinical use.
