Near-infrared emission from PbS quantum dots in polymer matrix

PbS quantum dots were prepared in the aqueous medium from readily available precursors. The shape of the particles is approximately spherical, and the average particle size observed from HRTEM image was 7-8 nm. We applied PbS quantum dots and PMMA polymer to fabricate PbS quantum dots-PMMA composites, and investigate the photoluminescence PbS quantum dots in PMMA matrix with different mass ratio. PbS quantum dots in PMMA matrix have broad emission between 900 nm and 1 500 nm and photoluminescence peak at 1 179 nm. Additionally, the photoluminescence intensity increases with increasing the dopant concentration. PbS quantum dots-PMMA polymer composites can be potentially used for polymer optical fiber and electroluminescence (EL) in optical communication.