| Photoactivation of CdSe/ZnS quantum dots embedded in silica colloids. | |
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MedLine Citation:
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PMID: 18712754 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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A study of the influence of the local environment on the light-induced luminescence enhancement of CdSe/ZnS quantum dots (QD) embedded in silica colloids that are dispersed in various solvents is presented. The photoluminescence of the embedded QD is enhanced up to a factor of ten upon photoactivation by ultraviolet or visible light. This enhancement is strongly dependent on the local environment. The thickness-dependent permeability of the silica shell covering the QD controls the influence of the solvent on the QD. If foreign ions are present the activation state is stabilized after termination of the activation, whereas in their absence the process is partially reversible. A new qualitative model for the photoactivation of QD in various environments is developed. It comprises light-induced passivation and subsequent oxidation processes. The embedded QD also retain their fluorescence quantum yield inside living cells. Moreover, they can be activated for many hours in living cells by laser radiation in the visible regime. |
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Authors:
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Sofia Dembski; Christina Graf; Tim Krüger; Uwe Gbureck; Andrea Ewald; Anne Bock; Eckart Rühl |
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Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't |
Journal Detail:
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Title: Small (Weinheim an der Bergstrasse, Germany) Volume: 4 ISSN: 1613-6829 ISO Abbreviation: Small Publication Date: 2008 Sep |
Date Detail:
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Created Date: 2008-09-08 Completed Date: 2008-11-03 Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 101235338 Medline TA: Small Country: Germany |
Other Details:
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Languages: eng Pagination: 1516-26 Citation Subset: IM |
Affiliation:
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Lehrstuhl für Physikalische Chemie I Universität Würzburg Am Hubland, Germany. |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Cadmium Compounds
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chemistry* Colloids Microscopy, Electron, Transmission Photochemistry Quantum Dots* Selenium Compounds / chemistry* Silicon Dioxide / chemistry* Sulfides / chemistry* Zinc Compounds / chemistry* |
| Chemical | |
Reg. No./Substance:
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0/Cadmium Compounds; 0/Colloids; 0/Selenium Compounds; 0/Sulfides; 0/Zinc Compounds; 1306-24-7/cadmium selenide; 1314-98-3/zinc sulfide; 7631-86-9/Silicon Dioxide |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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