Multiple doping effect of LiYF4:Yb3+/Er3+/Ho3+/Tm3+@LiYF4:Yb3+ core/shell nanoparticles and its application in Hg2+ sensing detection

被引：25

作者：

Chien, Hsiu-Wen ^{[1
]}

Wu, Cheng-Hsien ^{[2
]}

Yang, Chien-Hsin ^{[2
]}

Wang, Tzong-Liu ^{[2
]}

机构：

[1] Natl Kaohsiung Univ Sci & Technol, Dept Chem & Mat Engn, Kaohsiung 807, Taiwan

[2] Natl Univ Kaohsiung, Dept Chem & Mat Engn, Kaohsiung 811, Taiwan

来源：

JOURNAL OF ALLOYS AND COMPOUNDS | 2019年 / 806卷

关键词：

Lanthanide-doped; Core/shell; UCNP; Ligand exchange; Chemosensor; UP-CONVERSION NANOPARTICLES; THERMAL-DECOMPOSITION; SURFACE MODIFICATION; COMPLEX-FORMATION; LUMINESCENCE; EMISSION; ER3+; HO3+; NANOCRYSTALS; GLUTATHIONE;

D O I：

10.1016/j.jallcom.2019.07.258

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

We report the synthesis of lanthanide-doped core/shell upconverting nanoparticles (UCNPs) LiYF4:Yb3+/Er3+/Ho3+/Tm3+@LiYF4:Yb3+. The photoluminescence (PL) spectra of the tetragonal-phase nanoparticles could be tuned by varying the doping ratio of lanthanide ions (Er3+, Ho3+, Tm3+) and their intensities were much enhanced through the active core/active shell strategy. The as-synthesized UCNPs were characterized and confirmed by X-ray diffraction (XRD), transmission electron microscope (TEM), and PL spectroscopy. By varying the composition and concentration of the dopant ions, the upconversion emissions upon near-infrared (NIR) excitation at 980 nm can be precisely modulated. After overcoating UCNP cores with LiYF4:Yb3+ shell, the upconversion emissions for all core/shell nanoparticles were about 3 times of those corresponding core nanoparticles. After ligand exchange, the hydrophobic LiYF4:Yb3+/Er3+/Ho3+/Tm3+@LiYF4:Yb3+ core/shell nanoparticles could be transferred into hydrophilic UCNPs. The colloid nanoparticles could be employed as a chemosensor for detection of Hg2+ at near-infrared excitation wavelengths. (C) 2019 Elsevier B.V. All rights reserved.

引用

页码：272 / 282

页数：11

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[1] Synthesis of colloidal upconverting NaYF4 nanocrystals doped with Er3+, Yb3+ and Tm3+, Yb3+ via thermal decomposition of lanthanide trifluoroacetate precursors [J].