Lead Sulfide Quantum Dots (PbS QD) 850 nm

Lead Sulfide (PbS) Quantum Dots, engineered for a peak emission at 850 nm, provide an exceptional bridge between the visible and near-infrared spectrums. At this size regime, these nanocrystals exhibit intense quantum confinement, resulting in a sharp excitonic absorption peak and high photoluminescence quantum yield. The 850 nm wavelength is strategically significant as it offers high atmospheric transmission and is ideally suited for integration with existing silicon-based CMOS technologies. These dots are synthesized to ensure high monodispersity and are passivated with advanced surface ligands to minimize non-radiative recombination. This leads to superior charge carrier dynamics, making them a premier choice for high-speed optoelectronics and stable, high-luminance infrared emission.

Applications

• Silicon-Compatible Photodetectors: Acts as a sensitizing layer to extend the spectral range of silicon photodiode arrays, enhancing performance in LiDAR, biometric scanning, and 3D mapping.
• Night Vision & Surveillance: Utilized in the development of 850 nm IR-LEDs and sensors for covert illumination and security cameras, where light is invisible to the human eye but clear for electronic sensors.
• Advanced Photovoltaics: Integrated into the front or back layers of solar cells to harvest high-energy NIR photons, optimizing the spectral response and overall power conversion efficiency.
• NIR-I Bioimaging: Serves as a bright fluorescent probe for in-vivo imaging, providing deep tissue penetration with low interference from natural biological background signals.
• Thin-Film Transistors (TFTs): Used as a high-mobility, tunable semiconductor in printed electronics for flexible sensors and wearable infrared-detecting devices.
• Electrocatalysis: Leveraged for their large surface-to-volume ratio and specific electronic states to act as efficient catalysts for electrochemical energy storage and gas reduction reactions.
• Optical Proximity Sensors: Employed in consumer electronics (smartphones, tablets) for high-accuracy distance and gesture sensing using low-power infrared signaling.