Oil Dispersible Cu:ZnCdS/ZnS Quantum Dots
Product Description
Alfa Chemistry offers copper-doped quantum dots in the emission range of 480 nm to 620 nm. Copper-doped quantum dots are functionalized quantum dots consisting of a copper-doped ZnS core encapsulated by a ZnS shell. The product has a broad absorption spectrum but a narrow and symmetric emission spectrum, along with a high and stable fluorescence intensity and high quantum field. Our Cu-doped quantum dots can be used for highly sensitive cell imaging, photovoltaic devices, solar cells, and light-emitting devices. Oil-soluble Cu:ZnCdS/ZnS QDs are hydrophobic group-functionalized quantum dots, which are core/shell fluorescent nanomaterials with Cu-doped ZnCdS as the core and ZnS as the shell, with emission peaks from 480 nm to 620 nm and quantum yields ≥ 30%.
Features
Our products have the characteristics of uniform particle size, broad absorption spectrum, symmetrical emission spectrum, high and stable fluorescence intensity.
Applications
For the blue light component of quantum dot light emitting diodes (QLEDs), but also for solar cells and biofluorescent labeling.
Storage conditions
4°C sealed and protected from light.
Preparation Route
Pure, color-tunable colloidal Cu-doped ZnCdS NCs (d-dots) with photoluminescence (PL) were prepared in a wide spectral range (from 517 to 650 nm) based on a "co-core doping" strategy. The effects of various experimental variables, including the Cd/Zn ratio, Cu doping concentration, pH and the amount of mercaptopropionic acid (MPA), on the optical properties of Cu-doped ZnCdS NCs were systematically investigated. In addition, efficient and stable doping emission of Cu:ZnCdS/ZnS core/shell d-dots with PL quantum yields up to 40% was achieved by depositing ZnS shells around the naked Cu:ZnCdS cores.
Fig.1 TEM images of the Cu:ZnCdS core and Cu:ZnCdS/ZnS core/shell d-dots. (Zeng et al., 2014)
White Light Emitting Diodes
Copper-doped quantum dots (QDs) are used as color conversion materials for the preparation of highly efficient white light-emitting diodes (LEDs). Yuan et al. chemically synthesized Cu-doped quantum dots showing compositionally tunable emission from green to deep red and large Stokes shifts. A highly color-rendering white LED was fabricated by using a combination of green-emitting ZnInS:Cu QDs and red-emitting ZnCdS:Cu QDs with blue GaN chips. The resulting three-band RGB QD-white LED exhibits high performance with luminous efficacy of 71 lm/W, color rendering index up to 94, CIE-coordinates of (0.352 4,0.365 1), and color temperature of 4 788 K. Based on the changes in the photoluminescence lifetimes of Cu-doped QDs, it is found that the energy transfer process from green ZnInS:Cu QDs to red ZnCdS:Cu QDs can be negligible,because the red QDs had no absorption at green band. These results suggest that Cu-doped QDs are promising for solid state lighting.
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
- Zeng, Ruosheng, et al. Aqueous synthesis of Cu-doped ZnCdS/ZnS core/shell nanocrystals with a new and highly reactive sulfur source[J]. Nanotechnology, 2014, 25(13): 135602.
- Shen, Y. Y. , and R. S. Zeng . Study of Optical Properties of Cu,In Dual-Doped Quantum Dots[J]. Guangzhou Chemical Industry, 2015.
- Zhang Y., Liu S., Hua J., et al. Studies of photoluminescence properties and thermal stability of Cu doped ZnCdS/ZnS quantum dots by various host composition[J]. Journal of Materials Science: Materials in Electronics, 2019, 30(15): 14136-14142.
- Yuan, X. , et al. High Color Rendering White-light-emitting Diodes Based on Cu-doped ZnInS and ZnCdS Quantum Dots[J]. Chinese Journal of Luminescence, 2015, 36(11):1258-1265.
* It should be noted that our service is only used for research, not for clinical use.
