Lanthanide-Doped NaYF4 Nanocrystals in Aqueous Solution Displaying Strong Up-Conversion Emission
- 21 February 2007
- journal article
- research article
- Published by American Chemical Society (ACS) in Chemistry of Materials
- Vol. 19 (6), 1396-1400
- https://doi.org/10.1021/cm062385b
Abstract
NaYF4:Yb3+,Er3+ nanocrystals showing high colloidal solubility in water have been obtained by treating the nanocrystals with 1-hydroxyethane-1,1-diphosphonic acid (HEDP). HEDP attaches to the surface of the nanoparticles and leads to well-separated particles in aqueous solution as verified by IR spectroscopy and dynamic light scattering measurements. In addition, the surface modification with HEDP increases strongly the up-conversion efficiency of powders and aqueous colloidal solutions of the nanocrystals. These attractive features, above all the hydrophilic nature of the nanoparticles, should make them suitable especially for bio-applications.This publication has 24 references indexed in Scilit:
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