Perovskite Quantum Dots Supplier - Alfa Chemistry

Oil Dispersible Mn Doped Quantum Dots

Oil Dispersible Mn Doped Quantum Dots

Product Description

Alfa Chemistry offers manganese doped core-shell quantum dots with emission range from 580 nm to 620 nm. Manganese doped quantum dots have broad absorption spectra but narrow and symmetric emission spectra, high and stable fluorescence intensity, and high quantum fields. Our manganese doped quantum dots can be used for high sensitivity cell imaging, photovoltaic devices, solar cells and light emitting devices.


Our products have the characteristics of uniform particle size, broad absorption spectrum, symmetrical emission spectrum, high and stable fluorescence intensity.


Solar Cells

Ganguly et al. synthesized CdS and Mn2+-doped CdS quantum dots with different concentrations on polyvinyl alcohol substrates by a simple chemical method. The doped and undoped CdS quantum dots were characterized by using UV-Vis absorption spectroscopy, X-ray diffraction and energy dispersive X-ray spectroscopy to reveal the changes in optical and structural properties due to the doping of Mn. The synthesized quantum dots were used as sensitization layers for ZnO thin-film solar cells and tested under artificial illumination conditions to obtain current density-voltage characteristics. The Mn-doped CdS quantum dots obtained an efficiency of about 2.09% compared to 1% efficiency of pure CdS quantum dot sensitized solar cells.

(a) General structure and (b) working of a typical QDSSC.Fig. 1 (a) General structure and (b) working of a typical QDSSC. (Ganguly et al., 2020)


Mn-doped ZnS quantum dots covered by L-cysteine (Mn@ZnS/L-cyst) and polyethylene glycol (Mn@ZnS/PEG), and Mn-doped ZnS on zeolite NaY (Mn@ZnS/Y) were synthesized by Ahmadi et al. Then, these three photocatalysts were investigated under UV irradiation for 4′,5′-dibromofluorescein dye degradation ability. The results showed that the optimal catalyst dosages were 0.017 g L-1 for Mn-doped ZnS quantum dots on L-cysteine capped and Mn-doped ZnS on NaY zeolite and 0.033 g L-1 for Mn-doped ZnS quantum dots on polyethylene glycol capped, and the degradation efficiency of all three photocatalysts reached 97%.

TEM micrographs of a Mn@ZnS/L-cyst (scale 50 nm), b Mn@ZnS/PEG (scale 100 nm), and c Mn@ZnS/Y (scale 100 nm). The QDs nanoparticles are specified in the images.Fig. 2 TEM micrographs of a Mn@ZnS/L-cyst (scale 50 nm), b Mn@ZnS/PEG (scale 100 nm), and c Mn@ZnS/Y (scale 100 nm). The QDs nanoparticles are specified in the images. (Ahmadi et al., 2020)

DNA Detection

Mn-doped ZnS quantum dots (QDs) coated by 3-mercaptopropionic acid (MPA) and methylene blue (MB) formed nanobridges by electrostatic interaction, which were then used to detect trace DNA. MB bound to Mn-doped ZnS QDs by electrostatic interaction and then quenched the room temperature phosphorescence (RTP) of the QDs by photo-induced electron transfer (PIET). Upon addition of DNA, MB binds to DNA by intercalation and electrostatic interaction and desorbs from the surface of Mn-doped ZnS QDs, thus restoring the RTP of QDs. Based on this, Yan et al. developed a DNA detection method based on RTP properties. The method showed a detection range of 0.2-20 mg/L and a detection limit of 0.113 mg/L. Since the method is based on the RTP of QDs, it is not interfered by in vivo background fluorescence or scattered light, and therefore, complicated sample pretreatment is avoided.

(a) General structure and (b) working of a typical QDSSC.Fig. 3 TEM image of MPA-capped Mn-doped ZnS QDs. (Yan et al., 2016)

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.


  1. Ganguly, A. , and S. S. Nath . Mn-doped CdS quantum dots as sensitizers in solar cells[J]. Materials Science and Engineering, 2020, 255(May):114532.1-114532.5.
  2. Ahmadi, Z. , et al. Synthesis of zeolite NaY supported Mn-doped ZnS quantum dots and investigation of their photodegradation ability towards organic dyes[J]. Environmental Science and Pollution Research, 2020.
  3. Yan, et al. DNA detection based on Mn-doped ZnS quantum dots/methylene blue nanohybrids[J]. Chinese Chemical Letters, 2016(5):773-778.
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