Journal
CHEMICAL PHYSICS LETTERS
Volume 519-20, Issue -, Pages 73-77Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.cplett.2011.11.034
Keywords
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Funding
- National Natural Science Foundation of China (NSFC) [61106066]
- Zhejiang Provincial Science Foundation for Distinguished Young Scholars [R4100242]
- Zhejiang Provincial Nature Science Foundation [Y4110529]
- Ningbo Municipal Natural Science Foundation [2011A610093, 2011A610094]
- China Postdoctoral Science Foundation [20100481063]
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Hydrophobic Mn-doped ZnS quantum dots (Mn:ZnS d-dots) were made to be water soluble by coating a monolayer of mercaptopropionic acid (MPA). It is found that the PL efficiency of Mn: ZnS d-dots with various shell thicknesses were all improved after thiol (MPA) ligand exchange. We attribute their PL enhancement to the effective surface passivation induced by the thiol ligand and significantly decrease of holes transfer from d-dots to ligands. The PL QY of as-synthesized thiol-coated d-dots can reach as high as 50%. These efficient, stable, and water soluble d-dots are confirmed to be suitable for biomedical applications. (C) 2011 Elsevier B.V. All rights reserved.
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