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Monodisperse NaYbF4: Tm3+/NaGdF4 core/shell nanocrystals with near-infrared to near-infrared upconversion photoluminescence and magnetic resonance properties
KTH, School of Biotechnology (BIO), Theoretical Chemistry and Biology.
KTH, School of Biotechnology (BIO), Theoretical Chemistry and Biology.ORCID iD: 0000-0002-1763-9383
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2011 (English)In: NANOSCALE, ISSN 2040-3364, Vol. 3, no 5, 2003-2008 p.Article in journal (Refereed) Published
Abstract [en]

We report core/shell NaYbF4 : Tm3+/NaGdF4 nanocrystals to be used as probes for bimodal near infrared to near infrared (NIR-to-NIR) upconversion photoluminescence (UCPL) and magnetic resonance (MR) imaging. The NaYbF4 : Tm3+ nanocrystals were previously reported to produce the intense NIR-to-NIR UCPL peaked at similar to 800 nm under excitation at similar to 975 nm. We have found that the growth of a NaGdF4 shell on surface of the NaYbF4 : Tm3+ nanocrystals results in the increase in the intensity of UCPL of Tm3+ ions by about 3 times. Unlike biexponential PL decay of NaYbF4 : Tm3+ nanocrystals, the PL decay of NaYbF4 : Tm3+/NaGdF4 core/shell nanocrystals is single exponential and of longer lifetime due to the suppression of surface quenching effects for Tm3+ PL. The growth of a NaGdF4 shell on surface of the NaYbF4 : Tm3+ nanocrystals also provides high MR relaxivity from paramagnetic Gd3+ ions contained in the shell. The T1-weighted MR signal of the (NaYbF4:2% Tm3+)/NaGdF4 nanoparticles was measured to be about 2.6 mM(-1)s(-1). Due to the combined presence of efficient optical and MR imaging capabilities, nanoprobes based on NaYbF4 : Tm3+/NaGdF4 fluoride nanophosphors can be considered as a promising platform for simultaneous bimodal PL and MR bioimaging.

Place, publisher, year, edition, pages
2011. Vol. 3, no 5, 2003-2008 p.
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Theoretical Chemistry
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URN: urn:nbn:se:kth:diva-34207DOI: 10.1039/c0nr01018aISI: 000290531500011Scopus ID: 2-s2.0-79956090528OAI: oai:DiVA.org:kth-34207DiVA: diva2:423720
Funder
Swedish e‐Science Research Center
Note

QC 20110616

Available from: 2011-06-16 Created: 2011-05-30 Last updated: 2016-12-23Bibliographically approved

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Ågren, Hans

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