Issue 38, 2012

Synthesis of Li1−xNaxYF4:Yb3+/Ln3+ (0 ≤ x ≤ 0.3, Ln = Er, Tm, Ho) nanocrystals with multicolor up-conversion luminescence properties for in vitro cell imaging

Abstract

In this paper, we demonstrated the synthesis of Li1−xNaxYF4:Yb3+/Ln3+ (0 ≤ x ≤ 0.3, Ln = Er, Tm, Ho) upconversion nanocrystals (UCNCs) via a simple high boiling solvent process. The size and morphology of the Li1−xNaxYF4 NCs can be tuned by varying the doping amount of Na+. Furthermore, the introduction of Na+ also affects their upconversion luminescence properties. By changing the dopant's species (Ln3+) and the doping concentration of Na+, multicolor (green, blue, red, yellow, orange and white) upconversion emissions can be obtained. In addition, the as-prepared OA-capped hydrophobic LiYF4:Yb3+/Er3+ nanocrystals were modified with sodium dodecylsulfate (SDS) to convert them into hydrophilic ones. MTT (3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide) assay indicates that the SDS-modified LiYF4:Yb3+/Er3+ NCs exhibit good biocompatibility. Meanwhile, the application of these hydrophilic LiYF4:20%Yb3+/2%Er3+ and Li0.7Na0.3YF4:20%Yb3+/2%Er3+ NCs in the luminescence imaging of cells were also investigated, which showed bright green and red emissions without background noise, respectively. So these UCNCs are promising for multiple cell imaging.

Graphical abstract: Synthesis of Li1−xNaxYF4:Yb3+/Ln3+ (0 ≤ x ≤ 0.3, Ln = Er, Tm, Ho) nanocrystals with multicolor up-conversion luminescence properties for in vitro cell imaging

Supplementary files

Article information

Article type
Paper
Submitted
18 Jun 2012
Accepted
16 Aug 2012
First published
16 Aug 2012

J. Mater. Chem., 2012,22, 20618-20625

Synthesis of Li1−xNaxYF4:Yb3+/Ln3+ (0 ≤ x ≤ 0.3, Ln = Er, Tm, Ho) nanocrystals with multicolor up-conversion luminescence properties for in vitro cell imaging

D. Yang, Y. Dai, P. Ma, X. Kang, M. Shang, Z. Cheng, C. Li and J. Lin, J. Mater. Chem., 2012, 22, 20618 DOI: 10.1039/C2JM33910B

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