Perovskite Quantum Dots Supplier - Alfa Chemistry

Water Dispersible CdTe/CdS Quantum Dots

Product Description

Alfa Chemistry offers water-soluble CdTe/CdS core-shell quantum dots with an emission range of 540 nm to 640 nm. These quantum dots consist of CdTe as the core and CdS as the shell, with the QDs surface surrounded by hydrophilic groups. They have a broad absorption spectrum but a narrow and symmetric emission spectrum, along with uniform particle size, biocompatibility, high and stable fluorescence intensity, and high quantum fields.


Fluorescent Bioprobes

Two different colors of water-soluble core-shell quantum dots CdTe/CdS (green and orange-red) were synthesized and characterized by Xu et al. These two fluorescent probes have been used simultaneously in human breast cancer cells fluorescence imaging of MDA-MB-231/MDR. It can be seen that the anticancer drug can be retained in cancer cells in the presence of P-gp inhibitors distributed on the cell membrane. Depending on the color of the quantum dots on the probe, visualization of the action of the anticancer drug and the P-gp inhibitor can be obtained. This study shows that the preparation of functional biological probes using core-shell quantum dots CdTe/CdS has great potential for biomedical research such as anti-cancer drugs.

The preparation process of CdTe/CdS core/shell quantum dots.Fig. 1 The preparation process of CdTe/CdS core/shell quantum dots. (Xu et al., 2019)


Hallaj et al. produced CdTe@CdS QDs and (E)-2, -(4, 4’-dioxo-2, 2’-dithioxo-2H, 2’H-[5, 5’-bithiazolylidene]-3, 3’(4H, 4’H)-diyl) bis(3-mercaptopropanoic acid) (DTM)-covered CdTe@CdS QDs. Due to the selective interaction of DTM with Hg(II), DTM-CdTe@CdS/QDs are used as an effective fluorescence sensing material. DTM-CdTe@CdS/QDs show intense fluorescence emission in the absence of Hg2+ and effective in the presence of Hg2+ quenched, and a strong and stable complex was formed between Hg2+ and DTM. The constructed aptamer sensor showed high selectivity for mercury ions, even in the presence of other interfering metal ions, with a concentration ratio of more than 300 times.

2 Schematic representation of the fluorescence sensor for Hg2+ detection.Fig. 2 Schematic representation of the fluorescence sensor for Hg2+ detection. (Hallaj et al., 2019)

Solar Cells

The performance of CdTe solar cells (glass/tin dioxide/cadmium/cadmium telluride) was investigated by Shukla et al. When the temperature was fixed at 300 K, a high efficiency of 18.09% was obtained using 1500 nm CdTe, 25 nm CdS and 100 nm SnO2 with a doping concentration of 1 × 1016 cm-3 for CdTe and 6 × 1018 cm-3 for the CdS layer, with Pt as the back contact (VOC = 1.6753, JSC = 24.225212, FF = 44.57).

(a) Conventional baseline structure. (b) Modified structure for higher performance.Fig. 3 (a) Conventional baseline structure. (b) Modified structure for higher performance. (Shukla 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.


  1. Xu, N. , et al. Imaging of water soluble CdTe/CdS core-shell quantum dots in inhibiting multidrug resistance of cancer cells[J]. Talanta, 2019, 201:309-316.
  2. Hallaj, R. , et al. Synthesis and characterization of novel bithiazolidine derivatives-capped CdTe/CdS quantum dots used as a novel Hg2+ fluorescence sensor[J]. Spectrochimica Acta Part A Molecular & Biomolecular Spectroscopy, 2019, 216:418-423.
  3. Shukla, V. , and G. Panda . The performance study of CdTe/CdS/SnO2 solar cell[J]. Materials today: proceedings, 2020, 26.
* It should be noted that our service is only used for research, not for clinical use.


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