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Authors: Yolanda Justo, Bart Goris, John Sundar Kamal, P. Geiregat, Sara Bals, Zeger Hens
Title: Multipe Dot-in-Rod PbS/CdS Heterostructures with High Photoluminescence Quantum Yield in the Near-Infrared
Format: International Journal
Publication date: 3/2012
Journal/Conference/Book: Journal of the American Chemical Society
Volume(Issue): 134(12) p.5484–5487
DOI: 10.1021/ja300337d
Citations: 36 (Dimensions.ai - last update: 13/6/2021)
17 (OpenCitations - last update: 10/5/2021)
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Abstract

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 45–55%. 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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