Ultra-small GeSn quantum dots with visible photoluminescence

Ge 1− x Sn x alloy quantum dots (QDs) were synthesized with sizes ranging from 1-3 nm exhibiting visible orange-red photoluminescence. Composition dependent optical properties were characterized and supported by theoretical calculations. Structural analysis suggests the QDs are diamond cubic phase,...

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Bibliographic Details
Published in:Chemical communications (Cambridge, England) England), 2016-09, Vol.52 (78), p.11665-11668
Main Authors: Alan Esteves, Richard J, Hafiz, Shopan, Demchenko, Denis O, Özgür, Ümit, Arachchige, Indika U
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Summary:Ge 1− x Sn x alloy quantum dots (QDs) were synthesized with sizes ranging from 1-3 nm exhibiting visible orange-red photoluminescence. Composition dependent optical properties were characterized and supported by theoretical calculations. Structural analysis suggests the QDs are diamond cubic phase, characteristic of Ge 1− x Sn x thin films and nanocrystals (NCs) reported to date. Plot of theoretical energy gaps of Ge 1− x Sn x quantum dots. Background images are a TEM image of Ge 1− x Sn x quantum dots and a picture of a cuvette containing luminescent Ge 1− x Sn x QDs irradiated by a UV light.
ISSN:1359-7345
1364-548X
DOI:10.1039/c6cc04242b