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Luminescent stability of water-soluble PbS nanoparticles

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Abstract

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.

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Notes

  1. We note that some 1–8% uncertainty in the measurement of quantum efficiency may apply to the nanocrystals in this figure. It was omitted for clarity.

  2. Additional 0.33 mmol of DTG were introduced into the nanocrystal solution and stirred for 5 min every 2 weeks.

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Acknowledgements

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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Authors and Affiliations

  1. Guangzhou Institute of Chemistry, Chinese Academy of Sciences, P.O. Box 1122, Guangzhou, 510650, P.R. China

    Xu-Sheng Zhao, She-Yang Xu, Li-Yan Liang & Tao Li

  2. Department of Electrical and Computer Engineering, University of Toronto, 10 King’s College Rd, Toronto, ON, Canada, M5S 3G4

    Sam Cauchi

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  1. Xu-Sheng Zhao
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  2. She-Yang Xu
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Correspondence to Xu-Sheng Zhao.

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Zhao, XS., Xu, SY., Liang, LY. et al. Luminescent stability of water-soluble PbS nanoparticles. J Mater Sci 42, 4265–4269 (2007). https://doi.org/10.1007/s10853-006-0679-2

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  • DOI: https://doi.org/10.1007/s10853-006-0679-2

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