Luminescent stability of water-soluble PbS nanoparticles
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Thiol-capped PbS semiconductor nanoparticles (NPs) stabilized with a mixture of 1-thioglycerol/dithioglycerol (TGL/DTG) were colloidally prepared at room temperature. UV–vis spectroscopy and photoluminescence (PL) spectra showed an obvious red-shift in both the absorption shoulder and PL peak with the increase of DTG/Pb molar ratio. Room temperature photoluminescence quantum efficiency (PLQE) of freshly prepared PbS NPs (7–11%) remained higher than 5% upon aging for 3 weeks when the NPs were stored in an ice-bath in the dark, and higher than 5% for at least 5 weeks when additional DTG ligand was introduced into the nanoparticle solution every 2 weeks. The combination of reasonable room temperature quantum efficiency and strong, stable luminescence covering the 1.3 μm telecommunication window make these NPs promising materials in optical devices and telecommunications.
KeywordsAcetate Trihydrate Sodium Sulfide Extra Ligand Absorption Shoulder Telecommunication Window
Xusheng Zhao is grateful to the support of K.C. Wong Education Foundation, Hong Kong. This work was partly supported by National Natural Science Foundation of China, Scientific Research Foundation for the Returned Overseas Chinese Scholars, State Education Ministry, Guangdong Natural Science Foundation and Guangzhou municipal government. The authors thank Prof. Eugenia Kumacheva from the Department of Chemistry, University of Toronto, for fruitful discussions.
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