PbS core-type quantum dots oleic acid coated, fluorescence λem 1000 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-56001 |
| Concentration | 10mg/ml |
| Purity | 99.9% |
| Formula | PbS |
| Florescence | Λem 1000nm |
| APS | <10nm |
| Solvent | Toluene |
| Quantum Yield | 40-80% |
| FWHM | <30nm |
| Form | Liquid |
PbS core-type quantum dots
Introduction
PbS (Lead Sulfide) core-type quantum dots are a type of semiconductor nanocrystals made from lead sulfide. These quantum dots exhibit unique electronic and optical properties due to their small size and the quantum confinement effect, where the behavior of the particles is governed by quantum mechanics. The small size of PbS quantum dots allows for size-tunable absorption and emission, meaning their optical properties can be engineered by adjusting their size, which is a key advantage in many applications.
PbS quantum dots belong to the IV-VI semiconductor group and have a relatively narrow bandgap compared to other semiconductor quantum dots like CdSe (cadmium selenide). This bandgap enables PbS quantum dots to absorb and emit light in the infrared (IR) region, making them ideal for near-infrared (NIR) applications.
Unlike traditional materials, PbS quantum dots are considered more environmentally friendly compared to cadmium-based quantum dots because lead sulfide is less toxic in its nanocrystalline form, though still requiring careful handling in large quantities due to lead’s toxicity.
PbS quantum dots are typically synthesized in solution using methods like hot injection, solvothermal synthesis, or chemical vapor deposition, which allows for control over their size, shape, and optical properties.
Properties
Size-Tunable Optical Properties:
Tunable Bandgap: The optical properties of PbS quantum dots, such as absorption and emission wavelengths, can be easily tuned by controlling the size of the quantum dots. Smaller dots typically absorb and emit light at shorter wavelengths, while larger dots emit at longer wavelengths, including in the near-infrared (NIR) region.
Infrared Emission: PbS quantum dots are particularly valuable because they can emit in the near-infrared range (1,000–1,500 nm), which is highly desirable for biomedical imaging, solar energy applications, and telecommunication.
