Perovskite Quantum Dots Supplier - Alfa Chemistry

Water-soluble InP/ZnS Quantum Dots


Product Description

Water-soluble InP/ZnS quantum dot products are core/shell type fluorescent nanomaterials with InP as the core and ZnS as the shell layer, with the surface wrapped by hydrophilic ligands, and we currently offer products at 540 nm-690 nm.

The product has uniform particle size, broad absorption spectrum, narrow and symmetric emission spectrum, and high and stable fluorescence intensity. At present, we can provide the surface as carboxyl or amino, 3-mercaptopropionic acid (MPA) and PEG as the coating agent.

Product Applications

Applications include solar cells, light-emitting devices and biofluorescent labeling. In addition, quantum dots can also play a role in fingerprint rendering.

The water-soluble InP/ZnS quantum dots can clearly reveal the fingerprint details because the surface of InP/ZnS quantum dots modified by thioglycolic acid has hydroxyl groups, which can chemically couple or specifically physically adsorb with the proteins, amino acids, and proteins of the fingerprint residue through chemical coupling and electrostatic adsorption, respectively. The fingerprints are clearly visible because the modified InP/ZnS quantum dots have hydroxyl groups on the surface, which can be chemically coupled and electrostatically adsorbed to the proteins, amino acids, grease and sweat residues of the fingerprint material by chemical coupling or specific physical adsorption, respectively.

Fingerprint patterns shown-assisted by InP/ZnS QDs synthe sized at different temperature.Fig. 1 Fingerprint patterns shown-assisted by InP/ZnS QDs synthe sized at different temperature. (Xiong, 2011)

Advantages of Biological Application Properties

1. The emission spectrum of quantum dots can be controlled by changing the size of quantum dots. By changing the size of quantum dots and its chemical composition, the emission spectrum can be made to cover the whole visible region.

2. Quantum dots have good photostability. The light intensity of quantum dots is 20 times higher than that of the commonly used organic material "Rhodamine 6G", and its stability is more than 100 times that of "Rhodamine 6G". Therefore, quantum dots can be marked on the object for a long time view which also provides a powerful tool to study the long-term interactions between biomolecules in cells.

3. Quantum dots have a wide excitation spectrum and a narrow emission spectrum. The simultaneous detection of quantum dots with different particle sizes can be achieved by using the same excitation source, and thus can be used for multicolor labeling greatly facilitating the application in photolabeling.

4. Good biocompatibility. After various chemical modifications, quantum dots are less harmful to living organisms and can be used for biological in vivo labeling and detection. Among various quantum dots, silicon quantum dots have biocompatibility. For quantum dots containing cadmium or lead it is necessary to package decay treatment on their surface before biological applications.

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. Xiong H., et al. Synthesis of water-soluble InP/ZnS quantum dots and its application in developing fingerprint. Chemical Research, 2011.
* It should be noted that our service is only used for research, not for clinical use.


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