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Issue 21, 2009
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Monodisperse, size-tunable and highly efficient β-NaYF4:Yb,Er(Tm) up-conversion luminescent nanospheres: controllable synthesis and their surface modifications

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Abstract

Monodisperse, oil-dispersible β-NaYF4:Yb,Er(Tm) up-conversion (UC) luminescent nanospheres (NPs) have been successfully synthesized. The as-prepared NPs show high size-uniformity without any size-selection process, and the sizes of the NPs can be tuned in the range of 18 nm–45 nm, which are well suitable for biolabels. The NPs are thoroughly characterized and a growth mechanism is proposed. By co-doping Yb-Er or Yb-Tm, the as-prepared NPs can show bright green or blue UC luminescence under the irradiation of a 980 nm near-infrared (NIR) laser, and the UC luminescence can be obviously enhanced by constructing a NaYF4:Yb,Er@NaYF4 core/shell structure. Furthermore, the hydrophobic UC nanospheres (UCNPs) are converted into water-soluble by a robust ligand-exchange pathway with poly(acrylic acid). The presence of free carboxylic acid groups on their surfaces not only results in high solubility in water, but also allows further conjugation with biomolecules such as antigens, antibodies and oligonucleotides, which pave the way for potential bio-applications of the UCNPs.

Graphical abstract: Monodisperse, size-tunable and highly efficient β-NaYF4:Yb,Er(Tm) up-conversion luminescent nanospheres: controllable synthesis and their surface modifications

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Publication details

The article was received on 13 Nov 2008, accepted on 11 Mar 2009 and first published on 17 Apr 2009


Article type: Paper
DOI: 10.1039/B820254K
Citation: J. Mater. Chem., 2009,19, 3546-3553
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    Monodisperse, size-tunable and highly efficient β-NaYF4:Yb,Er(Tm) up-conversion luminescent nanospheres: controllable synthesis and their surface modifications

    C. Liu, H. Wang, X. Li and D. Chen, J. Mater. Chem., 2009, 19, 3546
    DOI: 10.1039/B820254K

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