Oil Dispersible PbS/CdS Quantum Dots
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Product Description
Alfa Chemistry offers oil-soluble PbS/CdS quantum dot products with PbS as the core and CdS as the shell layer, the surface is covered by hydrophobic ligands, the average quantum yield is 60%, the storage should avoid direct sunlight, 4 degrees sealed in the dark, can be customized to produce different grams of products at any wavelength from 850 nm to 1450 nm. The product has the characteristics of uniform particle size, broad absorption spectrum, narrow and symmetrical emission spectrum, high and stable fluorescence intensity, etc. It can be used in electronic communication, liquid crystal display, light-emitting diode, solar cell, biofluorescent labeling and other fields.
Applications
Fiber Optic Amplifier
PbS/CdS quantum dots synthesized in organic solvents are hydrophobic. In order to disperse the hydrophobic quantum dots into polar solvents, the quantum dots were modified with a specially formulated amphiphilic copolymer. The ultrasonically treated mixture was coated onto the tapered region of the fiber coupler to obtain the QD-doped film. The fiber amplifier was fabricated by dip-coating a silica sol doped with PbS/CdS quantum dots onto a fused tapered fiber coupler. The tapered dual fiber couplers are manufactured using standard SMF using flame fusion cone technology and can be easily coupled to other fiber optic devices. Using this dual fiber structure, both signal and pumping can be injected into the active region. Due to the shape of the tapered fiber, the swift wave can penetrate to the outer surface. The pump will excite the doped quantum dots through the swift wave. At the same time, the signal interacts with the excited quantum dots through the swift wave and is then amplified. For the swift wave excitation structure, the gain region must satisfy the total internal reflection condition.
Fig.1 (a) TEM image of PbS/CdS QDs. (b) HRTEM image of a PbS/CdS QD. (Sun, 2013)
Co-Sensitized Solar Cells
A novel TiO2 photoanode with graded hole distribution has been used for PbS/CdS QDSCs, which consists of a transparent layer with small holes and a light scattering layer derived from large nano-embossed hollow spheres. Meanwhile, screen-printable Cu2S/carbon composite counter electrodes were used to prepare PbS/CdS QDSCs. such photoanodes have large surface areas and graded pore distributions, which are well suited for quantum dot deposition and penetration of polysulfide electrolytes. Based on this photoanode, unprecedented IPCE and JSC were obtained, and conversion efficiencies of up to 3.82% were achieved.
Fig. 2. J-V characteristics of PbS/CdS QDSCs with different NL thickness (A) 6 μm, (B) 9 μm and (C) 12 μm. (Na, 2012)
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References
- Sun X., et al. Optical fiber amplifiers based on PbS/CdS QDs modified by polymers. Optics Express, 2013, 21(7):8214-8219.
- Na Z., et al. Highly efficient PbS/CdS co-sensitized solar cells based on photoanodes with hierarchical pore distribution. Electrochemistry Communications, 2012, 20(none):97-100.
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