ZnCdSeS alloyed Quantum Dots
Product Description
Alfa Chemistry offers alloyed ZnCdSeS quantum dots, the latest generation of low-cadmium, highly luminescent semiconductor nanocrystals with improved stability and compatibility with composite materials. The material is coated with hydrophobic organic molecules and is readily soluble in hexane, heptane, toluene, chloroform, tetrahydrofuran, and pyridine solvents.
The types of quantum dots we offer include:
Hydrophobic alloyed ZnCdSeS Quantum Dots Kit is supplied as a dry powder. Soluble in non-polar organic solvents (hexane, chloroform and benzene).
ZnCdSeS alloyed Quantum Dots are available from 470 nm to 630 nm. 440 ~ 480 nm for ZnCdSe/ZnS (core/shell) Quantum Dots Powder, hydrophobic highly luminescent semiconductor nanocrystals coated with hydrophobic organic molecules. Freely soluble in hexane, heptane, toluene, chloroform, tetrahydrofuran, pyridine. Insoluble in water, alcohol, ether.
Applications
Bioimaging
Huang et al. have synthesized ZnCdSeS quantum dots (QDs)-gold nanoparticles (Au NPs) hybrids by bifunctional junctional mercaptoacetic acid (MPA) in aqueous solution. The absorption peaks of both ZnCdSeS QDs and Au are located at 520 nm. The PL intensity of QD-Au hybrids was investigated as influenced by the amount of Au and the pH of the hybridization solution. The localized surface plasma resonance (LSPR) effect of QD-Au NPs has been demonstrated by the increased fluorescence intensity. The fluorescence enhancement can be maximized at an optimized pH of 8.5. The LSPR-enhanced photoluminescence properties of QD-Au hybrids will be beneficial for potential applications in bioimaging and detection.
Fig.1 TEM images of a Au NPs, b–f QDs-Au NPs hybrids. (Huang et al., 2015)
Light-Emitting Diodes
Jiang et al. presented a study on hybrid ZnCdSeS/ZnS quantum dot light-emitting diodes (QLEDs) devices fabricated with transparent electrodes without indium oxide. Aluminum-doped zinc oxide (AZO) prepared by magnetron sputtering with different sputtering pressures was used in the anodic transparent electrodes of the green QLEDs. Kelvin probe force microscopy measurements showed that the work function of AZO was about 5.0 eV. The AZO/poly(ethylene dioxythiophene)/polystyrene sulfonate (PEDOT:PSS) interface could be tuned by the sputtering pressure, which was confirmed by pure hole devices. AZO films with low surface roughness can form a good AZO/PEDOT:PSS interface, which can increase the hole injection and lead to an improved charge balance. The maximum current efficiency, brightness and external quantum efficiency of the optimized QLED devices can reach 50.75 cd A-1, 102 500 cd m-2 and 12.94%, respectively, at a sputtering pressure of 1 mTorr.
Fig.2 Typical AFM images of AZO films at a magnetron power of 125 W with different sputtering pressures for 40 min (a) 0.5 mTorr, (b) 1.0 mTorr, (c) 1.5 mTorr, (d) 2.0 mTorr, (e) 2.5 mTorr. (Jiang et al., 2020)
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
- Huang Q. Q., et al. Enhanced Photoluminescence Property for Quantum Dot-Gold Nanoparticle Hybrid.[J]. Nanoscale research letters, 2015, 10(1).
- Siffalovic, P. , et al. Evaluation of low-cadmium ZnCdSeS alloyed quantum dots for remote phosphor solid-state lighting technology[J]. Applied Optics, 2015.
- Jiang, X. , et al. Quantum dot light-emitting diodes with an Al-doped ZnO anode[J]. Nanotechnology, 2020, 31(25).
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