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Protected excitation-energy reservoir for efficient upconversion luminescence
KTH, School of Biotechnology (BIO), Theoretical Chemistry and Biology.
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2017 (English)In: Nanoscale, ISSN 2040-3364, E-ISSN 2040-3372, Vol. 10, no 1, 250-259 p.Article in journal (Refereed) Published
Abstract [en]

Lanthanide-doped upconversion nanoparticles (UCNPs) are of great interest for biomedical applications. Currently, the applicability of UCNP bionanotechnology is hampered by the general low luminescence intensity of UCNPs and inefficient energy transfer from UCNPs to surface-bound chromophores used e.g. for photodynamic therapy or analyte sensing. In this work, we address the low efficiency issue by developing versatile core-shell nanostructures, where high-concentration sensitizers and activators are confined in the core- and shell region, representatively for hexagonal NaYF4:Yb, Er UCNPs. After doping concentration optimization, the sensitizer-rich core, is able to harvest/accumulate more excitation energy and generate almost one order of magnitude higher luminescence intensity than conventional homogeneously doped nanostructures. At the same time, the activator ions located in the shell enable a ~6 times more efficient resonant energy transfer from UCNPs to surface-bound acceptor dye molecules due to the short distance between donor-acceptor pairs. Our work provides new insights into the rational design of UCNPs and will greatly increase the general applicability of upconversion nanotechnologies.

Place, publisher, year, edition, pages
Royal Society of Chemistry, 2017. Vol. 10, no 1, 250-259 p.
National Category
Nano Technology
Identifiers
URN: urn:nbn:se:kth:diva-217390DOI: 10.1039/C7NR06900FISI: 000418621000025Scopus ID: 2-s2.0-85039168166OAI: oai:DiVA.org:kth-217390DiVA: diva2:1156313
Funder
Swedish Research Council, 2015-00160;2016-03804
Note

QC 20171115

Available from: 2017-11-11 Created: 2017-11-11 Last updated: 2018-01-11Bibliographically approved

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Ågren, Hans

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CiteExportLink to record
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Citation style
  • apa
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  • ieee
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  • de-DE
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  • nn-NB
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  • Other locale
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Output format
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