Product Advantages: Small half-peak width of emission spectrum, high luminous efficiency, high stability, emission spectrum covering the near-infrared band.
Product Applications: Electronic communications, liquid crystal displays, light-emitting diodes, solar cells, biofluorescent markers, etc.
Storage Conditions: Sealed, avoid light, and keep at 4°C.
Product Description
As promising optoelectronic materials, oil-soluble PbS quantum dots (QDs) have attracted great attention. The oil-soluble oleic acid-capped near-infrared (NIR) emitting PbS QDs produced by Alfa Chemistry have a conveniently tunable photoluminescence (PL) emission (from ~800 to 1600 nm), a narrow PL bandwidth, as well as a high PL quantum yield (QY).
Product Parameters
| Catalog Number | PL Emission | FWHM | Surface Ligand | Quantum Yield | Solvent |
| GH-QD0017 | 850±50 nm | ≤120 nm | Oleic Acid | ≥60% | Toluene/Hexane/Octane |
| GH-QD0018 | 950±50 nm | ≤120 nm | Oleic Acid | ≥60% | Toluene/Hexane/Octane |
| GH-QD0019 | 1050±50 nm | ≤120 nm | Oleic Acid | ≥60% | Toluene/Hexane/Octane |
| GH-QD0020 | 1150±50 nm | ≤120 nm | Oleic Acid | ≥60% | Toluene/Hexane/Octane |
| GH-QD0021 | 1250±50 nm | ≤120 nm | Oleic Acid | ≥60% | Toluene/Hexane/Octane |
| GH-QD0022 | 1350±50 nm | ≤120 nm | Oleic Acid | ≥60% | Toluene/Hexane/Octane |
| GH-QD0023 | 1450±50 nm | ≤120 nm | Oleic Acid | ≥60% | Toluene/Hexane/Octane |
| GH-QD0024 | 1550±50 nm | ≤120 nm | Oleic Acid | ≥60% | Toluene/Hexane/Octane |
*If you can't find the needed QDs in the table, please send us an inquiry.
Alfa Chemistry always puts product quality in the first place. Our oil-soluble PbS QDs are rigorously tested to meet the highest industry standards. In addition, we know that each project is unique. This is why our products have a variety of specifications to choose from, and you can customize the characteristics of these QDs according to your specific requirements. If you have any need, please contact us immediately. We look forward to establishing a close cooperative relationship with you.
Related Products
Synthesis of Oil-soluble PbS Quantum Dots (QDs) by a Two-phase Approach
Deng, Dawei, et al. (2011): 2422-2432.
High-quality, oil-soluble PbS quantum dots (QDs) with tunable photoemission across the near-infrared (NIR) region (approximately 750–1000 nm) were synthesized using a two-phase approach. In this method, water-soluble Na₂S and thioacetamide were employed as sulfur sources, each differing in reactivity.
1) Preparation of the Pb Precursor Solution
To prepare the lead precursor solution, a typical reaction involved placing 38 mg of lead acetate, 0.13 mL of oleic acid, and 10 mL of n-decane into a continuously stirred flask. The mixture was then heated to 130°C for 20 minutes, until a clear lead oleate precursor solution was obtained. Afterward, the solution was cooled to the desired temperature (e.g., 40°C for synthesis with Na₂S as the sulfur precursor). The reaction was carried out under a nitrogen atmosphere to prevent the oxidation of the oxygen-sensitive oleic acid.
2) Synthesis of PbS QDs Using Na₂S as the Sulfur Source
Once the lead oleate precursor solution was cooled to 40°C, 5 mL of a freshly prepared 6 mM aqueous Na₂S solution was added dropwise to the reaction flask while stirring. The upper organic phase rapidly turned from pale yellow to dark brown within approximately one minute, indicating the formation of PbS QDs. This rapid color change occurred due to the high reactivity of Na₂S in the two-phase system. The reaction mixture was then stirred further at 40°C for 5 minutes. The solution was subsequently cooled to room temperature, and UV/Vis absorbance and photoluminescence (PL) measurements were taken without size sorting.
3) Synthesis of PbS QDs Using Thioacetamide as the Sulfur Source
For synthesis with thioacetamide, the freshly prepared lead oleate precursor solution was cooled to 60°C (or 65°C or 70°C), and a 5 mL, 6 mM solution of thioacetamide in water was injected into the reaction flask while stirring. The reaction mixture was then maintained at 60°C (or 65°C or 70°C) to promote the nucleation and growth of PbS QDs. Aliquots were taken at various time intervals, and UV/Vis absorbance and PL spectra were recorded for each aliquot.
This two-phase approach allows for the synthesis of PbS QDs with tunable properties suitable for a wide range of applications in the NIR region.
Transferring Oil-soluble PbS QDs into Water Using Glutathione
Deng, Dawei, et al. Journal of colloid and interface science 367.1 (2012): 234-240.
Monodispersed PbS quantum dots (QDs), capped with oleic acid and dispersed in n-decane, were synthesized using a two-phase approach. To transfer these oil-soluble QDs into water, the oleic acid molecules must be replaced by thiol ligands. Here, we describe the typical process for synthesizing water-soluble PbS QDs capped with glutathione (GSH).
Synthesis Process
1) Precipitation and Redispersion
The PbS QDs were first precipitated using acetone or ethanol to remove excess oleic acid. Afterward, the QDs were redispersed in chloroform to prepare them for ligand exchange.
2) Ligand Exchange with Glutathione
A 2 mL aliquot of PbS QDs in chloroform (concentration of 3 mM sulfur) was added dropwise to 2 mL of a 0.15 M GSH solution (pH 6).
3) Shaking and Transfer to Water
The mixture was shaken at room temperature for approximately 10 minutes. During this time, the QDs gradually transferred into the aqueous phase as the oleic acid was replaced by the GSH thiol groups. The surfaces of the QDs in water became negatively charged as a result of the GSH capping.
4) Collection and Storage
The supernatant, containing the water-soluble PbS QDs, was carefully collected and stored at room temperature in the dark for further analysis.
This method effectively transfers oil-soluble PbS QDs into an aqueous environment, making them suitable for various biological and analytical applications.
Fabrication of Near-infrared (NIR) Oil-soluble PbS QDs-loaded SOC Micelles
Cao, Jie, et al. Journal of Biomedical Materials Research Part A 100.4 (2012): 958-968.
Oil-soluble near-infrared (NIR) PbS quantum dots (QDs) were incorporated into biodegradable micelles for in vivo tumor imaging. The micelles used were N-succinyl-N'-octyl nanomicelles (SOC), which possess hydrophobic inner cores suitable for encapsulating the oil-soluble QDs.
Synthesis Process
1) Dispersion of PbS QDs
The oil-soluble PbS QDs were initially dispersed in chloroform.
2) Preparation of NIR QDs-loaded SOC Micelles
A 0.2 mL aliquot of PbS QDs (10 mM) was added dropwise to the SOC solution (1 mg/mL). The mixture was subjected to sonication at 100 W for 20 cycles to ensure uniform dispersion of the QDs within the SOC micelles.
3) Evaporation and Stirring
After sonication, the mixture was stirred at room temperature until the chloroform was completely evaporated, leaving the PbS QDs encapsulated within the SOC micelles.
4) Centrifugation and Collection
The resulting mixture was centrifuged to remove any unencapsulated material, and the PbS QDs-loaded SOC solution was collected and stored at room temperature for further use.
The surface of the PbS QDs was capped with a monolayer of oleic acid (OA) molecules, due to the coordination between the carboxyl groups of OA and the Pb cations. This interaction facilitates the non-covalent binding of the long-chain OA to the hydrophobic interior of the SOC micelles.
This method successfully encapsulates NIR PbS QDs in SOC micelles, offering a promising approach for in vivo imaging and tumor detection.
