PbS core-type quantum dots oleic acid coated, fluorescence λem 1400 nm, 10 mg/mL in toluene
Our PbS quantum dots have a fully crystalline inorganic core and are organically stabilized with an oleic acid coating, which makes their surface hydrophobic in nature. They exhibit high colloidal and thermal stability, as well as strong emissions with narrow fluorescence bands, owing to their small particle size distributions. These particles absorb all light in the UV, VIS and NIR, up to 900 nm. Their size-dependent absorption and emission properties make them suitable for different applications: such as, absorber materials in photovoltaics, detectors and photodiodes, and phosphors in IR-emitters (solid state lighting, SSL), among many others.
| PbS core-type quantum dots | |
| Product No. | NRE-56003 |
| Concentration | 10mg/ml |
| Purity | 99.9% |
| Formula | PbS |
| Florescence | Λem 1400nm |
| APS | <10nm |
| Solvent | Toluene |
| Quantum Yield | 40-80% |
| FWHM | <30nm |
| Form | Liquid |
PbS core-type quantum dots
PbS core-type quantum dots are a class of semiconductor nanomaterials that have garnered significant attention due to their unique electronic, optical, and chemical properties. Quantum dots (QDs) are nanoscale semiconductor particles that exhibit quantum mechanical effects, and in the case of PbS QDs, these effects arise from their size-dependent properties.
PbS is a group IV-VI compound semiconductor, and its quantum dots can be synthesized with controlled sizes, typically ranging from 2 to 10 nm, which influences their electronic structure and optical behavior. The most notable feature of PbS quantum dots is their ability to exhibit a size-tunable band gap. This means that by controlling the size of the quantum dots, their optical properties—such as absorption and emission wavelengths—can be tailored from the infrared (IR) to visible light region, which makes PbS quantum dots highly versatile for a range of applications.
PbS quantum dots have attracted particular interest in fields like optoelectronics, solar cells, bioimaging, and photocatalysis due to their strong absorption, high photoluminescence efficiency, and relatively simple synthesis processes.
Properties of PbS Quantum Dots
Size-Dependent Optical Properties: The band gap of PbS quantum dots can be tuned by varying the size of the particles, leading to a shift in the absorption and emission spectra. Smaller quantum dots tend to have a larger band gap, which results in the absorption of higher-energy (shorter-wavelength) light. Conversely, larger quantum dots have smaller band gaps and can absorb longer wavelengths, making them suitable for infrared applications.
High Photoluminescence Efficiency: PbS quantum dots exhibit strong photoluminescence, which makes them ideal candidates for imaging and light-emitting applications. This photoluminescence efficiency can be enhanced by optimizing the surface passivation techniques to reduce defects and recombination sites.
Quantum Confinement: Like other quantum dots, PbS quantum dots exhibit quantum confinement effects, where the electronic and optical properties are influenced by the size of the nanocrystals. These effects become more pronounced as the size of the dots decreases.
