Oil Dispersible ZnSe/ZnS Quantum Dots
Product Description
Alfa Chemistry offers ZnSe/ZnS core-shell semiconductor quantum dots in the emission range of 400 nm to 440 nm. ZnSe based quantum dots are considered as environmentally friendly wide bandgap nanomaterials and their suitability for cadmium-free blue-green light emission applications is investigated. Our ZnSe/ZnS quantum dots with uniform size distribution, high quantum yield and low toxicity can be used for highly sensitive cell imaging, solar cells and luminescent devices.
Applications
In Vitro and In Vivo Toxicity Analysis
Reshma et al. evaluated the toxicity of heavy metal-free ZnSe/ZnS QDs under two conditions, (i) HEK cells as an in vitro system and (ii) Swiss albino mice as an in vivo model. An acute toxicity study with 10 mg/kg ZnSe/ZnS QDs was performed in mice and no clinical or behavioral changes were observed. It did not induce any changes in hematological parameters or loss of body or organ weight. Only the liver showed significant moderate pathological changes, all other organs such as kidney, spleen and brain did not show any toxic manifestations.
Fig.1 Schematic diagram of in vitro and in vivo toxicity analysis of zinc selenide/zinc sulfide (ZnSe/ZnS) quantum dots. (Reshma et al., 2020)
White-light LEDs
Byambasuren et al. synthesized blue-emitting ZnSe core (C) and ZnSe/ZnS core/shell (C/S) quantum dots (QDs) from phosphorus-free precursors by a thermal decomposition method in paraffin oil solvent and applied them to QD-converted light-emitting diodes (LEDs). The optical properties of the synthesized ZnSe C and ZnSe/ZnS C/S QDs were characterized by absorption spectra and photoluminescence spectra.The ZnSe/ZnS C/S QDs show deep blue light with a peak at 425 nm. The blue-emitting ZnSe/ZnS C/S QDs were used as color conversion materials for near-UV LEDs pumped with blue LEDs and combined with yellow-emitting Zn-Cu-In-S/ZnS C/S QDs to fabricate white LEDs.
Fig.2 (a) EL spectra of the ZnSe/ZnS-converted blue LED at 60 mA and (b) CIE color coordinates of the ZnSe/ZnS-converted blue LED. (Byambasuren et al., 2021)
Photocatalysts
Hybrid photosynthesis is a promising method for converting carbon dioxide and visible light into multicarbon compounds, in which photocatalysts provide energy for the metabolism of autotrophic microorganisms. Yf et al. synthesized a heterostructured ZnSe/ZnS photocatalyst by a simple one-pot method and evaluated it for photocatalytic H2 evolution (PHE) and hybrid photosynthesis with the bioplastic-producing bacterium Ralstonia eutropha. The ZnSe/ZnS nanoparticles exhibited a 5.5-fold higher PHE than pure ZnSe. The ZnSe/ ZnS photoluminescence and photoelectrochemical properties suggest a more efficient charge separation probably due to ZnS defects. In addition, ZnSe/ZnS enhanced the production of bioplastics from CO2 by R. eutropha by a factor of 1.3, which was not the case for pure ZnSe.
Fig. 3 SEM and TEM characterization of ZnSe/ZnS. (Yf et al., 2021)
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
- Reshma, V. G. , et al. In vitro and In vivo toxicity analysis of Zinc Selenium/Zinc Sulfide (ZnSe/ZnS) Quantum dots[J]. Food and chemical toxicology: an international journal published for the British Industrial Biological Research Association, 2020, 145(10):111718.
- Byambasuren Nyamsuren, et al. Phosphine-Free-Synthesized ZnSe/ZnS Core/Shell Quantum Dots for White Light-Emitting Diodes[J]. Applied Sciences, 2021, 11(21).
- Yf, A , et al. The one-pot synthesis of a ZnSe/ZnS photocatalyst for H 2 evolution and microbial bioproduction[J]. International Journal of Hydrogen Energy, 2021.
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