Water dispersible upconverting nanoparticles: effects of surface modification on their luminescence and colloidal stability

URN to cite this document:

urn:nbn:de:bvb:355-epub-333099 Copy

DOI to cite this document:

10.5283/epub.33309 Copy

Wilhelm, Stefan ; Kaiser, Martin ; Würth, Christian ; Heiland, Josef ; Carrillo-Carrion, Carolina ; Muhr, Verena ; Wolfbeis, Otto S. ; Parak, Wolfgang J. ; Resch-Genger, Ute ; Hirsch, Thomas

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Date of publication of this fulltext: 16 Feb 2016 10:08

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Item type:	Article
Journal or Publication Title:	Nanoscale
Publisher:	Royal Society of Chemistry (RSC)
Volume:	7
Page Range:	pp. 1403-1410
Date:	2015
Additional Information (public):	Open Access Komponente aus der Allianzlizenz
Institutions:	Chemistry and Pharmacy > Institut für Analytische Chemie, Chemo- und Biosensorik > Chemo- und Biosensorik (Prof. Antje J. Bäumner, formerly Prof. Wolfbeis)
Identification Number:	Value Type 10.1039/C4NR05954A DOI
Dewey Decimal Classification:	500 Science > 540 Chemistry & allied sciences
Status:	Published
Refereed:	Yes, this version has been refereed
Created at the University of Regensburg:	Yes
Item ID:	33309

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Abstract

We present a systematic study on the effect of surface ligands on the luminescence properties and colloidal stability of β-NaYF4:Yb3+,Er3+ upconversion nanoparticles (UCNPs), comparing nine different surface coatings to render these UCNPs water-dispersible and bioconjugatable. A prerequisite for this study was a large-scale synthetic method that yields ∼2 g per batch of monodisperse oleate-capped ...

Abstract

We present a systematic study on the effect of surface ligands on the luminescence properties and colloidal stability of β-NaYF4:Yb3+,Er3+ upconversion nanoparticles (UCNPs), comparing nine different surface coatings to render these UCNPs water-dispersible and bioconjugatable. A prerequisite for this study was a large-scale synthetic method that yields ∼2 g per batch of monodisperse oleate-capped UCNPs providing identical core particles. These ∼23 nm sized UCNPs display an upconversion quantum yield of ∼0.35% when dispersed in cyclohexane and excited with a power density of 150 W cm−2, underlining their high quality. A comparison of the colloidal stability and luminescence properties of these UCNPs, subsequently surface modified with ligand exchange or encapsulation protocols, revealed that the ratio of the green (545 nm) and red (658 nm) emission bands determined at a constant excitation power density clearly depends on the surface chemistry. Modifications relying on the deposition of additional (amphiphilic) layer coatings, where the initial oleate coating is retained, show reduced non-radiative quenching by water as compared to UCNPs that are rendered water-dispersible via ligand exchange. Moreover, we could demonstrate that the brightness of the upconversion luminescence of the UCNPs is strongly affected by the type of surface modification, i.e., ligand exchange or encapsulation, yet hardly by the chemical nature of the ligand.

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Metadata last modified: 25 Nov 2020 23:02

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