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Enhanced Red Emission from GdF3:Yb3+,Er3+ Upconversion Nanocrystals by Li+ Doping and Their Application for Bioimaging

2012; Wiley; Volume: 18; Issue: 30 Linguagem: Inglês

10.1002/chem.201201053

1521-3765

Wenyan Yin, Lina Zhao, Liangjun Zhou, Zhanjun Gu, Xiaoxiao Liu, Gan Tian, S. Jin, Liang Yan, Wenlu Ren, Gengmei Xing, Yuliang Zhao,

Quantum Dots Synthesis And Properties

Under 980 nm near-infrared (NIR) excitation, upconversion luminescent (UCL) emission of GdF(3):Yb,Er upconversion nanoparticles (UCNPs) synthesized by a simple and green hydrothermal process can be tuned from yellow to red by varying the concentration of dopant Li(+) ions. A possible mechanism for enhanced red upconverted radiation is proposed. A layer of silica was coated onto the surface of GdF(3):Yb,Er,Li UCNPs to improve their biocompatibility. The silica-coated GdF(3):Yb,Er,Li UCNPs show great advantages in cell labeling and in vivo optical imaging. Moreover, GdF(3) UCNPs also exhibited a positive contrast effect in T(1)-weighted magnetic resonance imaging (MRI). These results suggest that the GdF(3) UCNPs could act as dual-modality biolabels for optical imaging and MRI.