Comparison of the Luminescence Properties of PbS Quantum Dots Prepared by Different Methods

Abstract:

PbS quantum dots (QDs) were prepared through a two-phase approach and an aqueous method respectively. The reaction conditions of the two-phase approach were mild and highly controllable, but the as-prepared QDs were capped with oleic acid. Although the PbS QDs prepared by the aqueous method did not exhibit excellent photoluminescence properties, it was more facile and environmentally friendly, and furthermore the resulting PbS QDs were more promising in biological labeling without ligand exchange. We have investigated the absorption and luminescent properties of QDs prepared by the two methods. The results showed that the absorption shoulder of oil soluble PbS QDs was at 580nm and water soluble PbS QDs was at 600~700nm. And the emission peaks in the photoluminescence spectra were at 755nm and 970nm, respectively. XRD analysis confirmed that the PbS QDs were cubic phase. The TEM results showed that the size of both types of PbS QDs was smaller than the excitons Bohr radius (18nm).

• Periodical: Materials Science Forum (Volumes 745-746)
• Pages: 616-620
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.745-746.616
• Online since: February 2013
• Authors: Xiang Wen Yu, Ming Hui Wang, Lian Jun Wang, Wan Jiang
• Keywords: Lead Sulfide, Photoluminescence (PL), Quantum Dot (QD), Quantum Size Effects

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