Title
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Multiple dot-in-rod PbS/CdS heterostructures with high photoluminescence quantum yield in the near-infrared
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Author
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Abstract
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Pb cations in PbS quantum rods made from CdS quantum rods by successive complete cationic exchange reactions are partially re-exchanged for Cd cations. Using STEM-HAADF, we show that this leads to the formation of unique multiple dot-in-rod PbS/CdS heteronanostructures, with a photoluminescence quantum yield of 4555%. We argue that the formation of multiple dot-in-rods is related to the initial polycrystallinity of the PbS quantum rods, where each PbS crystallite transforms in a separate PbS/CdS dot-in-dot. Effective mass modeling indicates that electronic coupling between the different PbS conduction band states is feasible for the multiple dot-in-rod geometries obtained, while the hole states remain largely uncoupled. |
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Language
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English
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Source (journal)
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Journal of the American Chemical Society. - Washington, D.C., 1879, currens
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Publication
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Washington, D.C.
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American Chemical Society
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2012
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ISSN
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0002-7863
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DOI
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10.1021/JA300337D
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Volume/pages
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134
:12
(2012)
, p. 5484-5487
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ISI
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000302489500015
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Full text (Publisher's DOI)
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Full text (publisher's version - intranet only)
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