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Issue 101, 2015
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Synthesis and characterization of upconversion nanoparticles with shell structure and ligand-free hydrophilic modification

Di Kang,a  Xiaoyan Songb  and  Jinfeng Xing*a 
Author affiliations

* Corresponding authors

a School of Chemical Engineering and Technology, Tianjin University, Tianjin, China
E-mail: jinfengxing@tju.edu.cn

b College of Material Science and Engineering, Tianjin Polytechnic University, Tianjin, China

Abstract

Ytterbium and erbium co-doped sodium yttrium fluoride (NaYF4:Er3+, Yb3+) rare-earth upconversion nanoparticles (UCNPs) with different phases were prepared and characterized. The luminescence intensity of UCNPs can be enhanced by coating a uniform layer of the shell. The crystal structure, morphology and upconversion spectra of the sample were investigated using X-ray powder diffractometry, transmission electron microscopy, and laser upconversion spectrometry with a 980 nm diode laser. Finally, UCNPs with core–shell structure were modified to be hydrophilic by ligand-free hydrophilic modification. Moreover, the water dispersible UCNPs have much stronger luminescence compared with hydrophobic UCNPs.

Graphical abstract: Synthesis and characterization of upconversion nanoparticles with shell structure and ligand-free hydrophilic modification

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Publication details

The article was received on 18 Aug 2015, accepted on 23 Sep 2015 and first published on 24 Sep 2015


Article type: Paper
DOI: 10.1039/C5RA16612H
Author version available: Download Author version (PDF)
Citation: RSC Adv., 2015,5, 83149-83154
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    Synthesis and characterization of upconversion nanoparticles with shell structure and ligand-free hydrophilic modification

    D. Kang, X. Song and J. Xing, RSC Adv., 2015, 5, 83149
    DOI: 10.1039/C5RA16612H

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