Perovskite Quantum Dots Supplier - Alfa Chemistry

PbS Quantum Dots

Product Description

Alfa Chemistry offers PbS quantum dots with the ability to easily prepare nanoparticles with significant quantum effects. The emission spectra of quantum dots can cover the near-infrared wavelength range and are easy to produce in large quantities, with excellent properties such as narrow size range, high color purity, and good stability.


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


Optical Fiber Amplifier

A PbS quantum dot optical fiber amplifier with enhanced processability and environmental stability is proposed by Sun et al. In the fabrication of the quantum dot fiber amplifier, it was demonstrated by spectroscopy that modification of PbS quantum dots with multifunctional copolymers facilitates the dispersion of quantum dots in sol-gel without degrading or changing the optical properties. With the addition of the fluorine-containing component, the PbS quantum dot fiber amplifier maintained 96% of the initial gain after 100 days, compared with only 16% for the quantum dots modified with the fluorine-free polymer, and it can be affirmed that the fluorine bonding of the multifunctional copolymer has a good improvement on the durability of the PbS quantum dots.

TEM image of the PbS QDs.Fig.1 TEM image of the PbS QDs. (Sun et al., 2018)

Solar Cells

Lv et al. successfully applied PbICl precursor solutions in N,N-dimethylformamide to deposit PbS quantum dots on TiO2 nanorod arrays by the continuous ion layer adsorption and reaction (SILAR) method. The photovoltaic performance of the solid-state PbS quantum dot-sensitized TiO2 nanorod array solar cells with spiro-OMeTAD was evaluated, and the average crystal sizes of PbS quantum dots were 9.0 nm for PbI2, 8.6 nm for PbBr2, and 8.4 nm for PbICl, and the photovoltaic conversion efficiencies of the corresponding solar cells reached 2.63%, 3.00%, and 3.45%, respectively.

Surface and cross-sectional SEM images of PbS QDs on TiO2 nanorod arrays using PbI2 (a, d), PbBr2 (b, e), PbICl (c, f) precursor solutions.Fig. 2 Surface and cross-sectional SEM images of PbS QDs on TiO2 nanorod arrays using PbI2 (a, d), PbBr2 (b, e), PbICl (c, f) precursor solutions. (Lv et al., 2018)


In order to overcome the obstacles currently faced by single-layer and hybrid PbS-QD photodetectors, Ren et al. designed a pure double-layer QD device that can be integrated on a flexible polyimide substrate and significantly outperforms conventional single-layer devices in terms of response speed, detection rate, linear dynamic range, and signal-to-noise ratio with comparable responsiveness. The results obtained here should be of great value for the study and design of advanced QD-based photodetectors for future applications in flexible optoelectronics.

a) The PbS-TBAI device. b) The PbS-EDT device. c) The bilayer device. d) Band diagram.Fig. 3 a) The PbS-TBAI device. b) The PbS-EDT device. c) The bilayer device. d) Band diagram. (Ren et al., 2017)

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. Sun, X. , et al. Enhancing environmental stability of a PbS quantum dot optical fiber amplifier via rational interface design[J]. Optical & Quantum Electronics, 2018, 50(4):173.
  2. Lv, K. , et al. PbICl precursor solutions for all solid-state PbS quantum-dot sensitized TiO2 nanorod array solar cells using successive ionic layer adsorption and reaction method[J]. Current Applied Physics, 2018, 18(6):648-651.
  3. Ren, Zhenwei, et al. Bilayer PbS quantum dots for high‐performance photodetectors[J]. Advanced materials, 2017, 29(33): 1702055.
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