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Subdiffraction, Luminescence-Depletion Imaging of Isolated, Giant, CdSe/CdS Nanocrystal Quantum Dots

TitleSubdiffraction, Luminescence-Depletion Imaging of Isolated, Giant, CdSe/CdS Nanocrystal Quantum Dots
Publication TypeJournal Article
Year of Publication2013
AuthorsLesoine, MD, Bhattacharjee, U, Guo, YJ, Vela, J, Petrich, JW, Smith, EA
JournalJournal of Physical Chemistry C
Volume117
Pagination3662-3667
Date Published02
Type of ArticleArticle
ISBN Number1932-7447
Accession NumberWOS:000315432100054
Keywordsblinking, fluorescence microscopy, limit, nanoscale, resolution, stimulated-emission-depletion
Abstract

40 +/- 10 nm was measured in the lateral direction for isolated g-NQDs at an air interface using luminescence depletion imaging, whereas the average full width at half-maximum was 450 +/- 90 nm using diffraction-limited, confocal luminescence imaging. Time-gating of the luminescence depletion data was required to achieve the stated spatial resolution. No observable photobleaching of the g-NQDs was present in the measurements, which allowed imaging with a dwell time of 250 ms per pixel to obtain images with a high signal-to-noise ratio. The mechanism for luminescence depletion is likely stimulated emission, stimulated absorption, or a combination of the two. The g-NQDs fulfill a need for versatile, photostable tags for subdiffraction imaging schemes where high laser powers or long exposure times are used.

DOI10.1021/jp312231k
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Nanodomains

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NSF

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3D Catalysis