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Proceedings Paper

Control of photoinduced fluorescence enhancement of colloidal quantum dots using metal oxides
Author(s): Seyed M. Sadeghi; Waylin J. Wing; Kira Patty; Quinn Campbell
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Paper Abstract

It is well known that irradiation of colloidal quantum dots can dramatically enhance their emission efficiencies, leading to so-called photoinduced fluorescence enhancement (PFE). This process is the result of the photochemical and photophysical properties of quantum dots and the way they interact with the environment in the presence of light. It has been shown that such properties can be changed significantly using metal oxides. Using spectroscopic techniques, in this paper we investigate emission of different types of quantum dots (with and without shell) in the presence of metal oxides with opposing effects. We observed significant increase of PFE when quantum dots are deposited on about one nanometer of aluminum oxide, suggesting such oxide can profoundly increase quantum yield of such quantum dots. On the other hand, copper oxide can lead to significant suppression of emission of quantum dots, making them nearly completely dark instantly.

Paper Details

Date Published: 9 October 2015
PDF: 7 pages
Proc. SPIE 9545, Nanophotonic Materials XII, 95450H (9 October 2015); doi: 10.1117/12.2188512
Show Author Affiliations
Seyed M. Sadeghi, The Univ. of Alabama in Huntsville (United States)
Waylin J. Wing, The Univ. of Alabama in Huntsville (United States)
Kira Patty, The Univ. of Alabama in Huntsville (United States)
Quinn Campbell, The Univ. of Alabama in Huntsville (United States)

Published in SPIE Proceedings Vol. 9545:
Nanophotonic Materials XII
Stefano Cabrini; Gilles Lérondel; Adam M. Schwartzberg; Taleb Mokari, Editor(s)

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