期刊
JOURNAL OF ALLOYS AND COMPOUNDS
卷 455, 期 1-2, 页码 376-384出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2007.01.107
关键词
nanostructured materials; chemical synthesis; luminescence
Polyol method has been successfully used to prepare Yb3+/Er3+ and Yb3+/Tm3+ codoped NaYF4 nanocrystal upconversion phosphors. Three kinds of polyols (glycol, diethylene glycol and glycerol) were used not only as reaction medium but also as size-controlled capping ligands to limit particle growth and stabilize the particles. Nanoparticles crystallized in pure cubic phase were obtained via the polyol method, then cubicto-hexagonal phase transition of the nanoparticles occurred during the follow-up solvothermal treatment. Factors that had impact on the structure and morphology of the nanoparticles and affected the fluorescent performance of the nanocrystal upconversion phosphors were discussed. The obtained Yb3+/Er3+ and Yb3+/Tm3+ codoped NaYF4 nanoparticles could be well dispersed in water, and they could emit multicolor upconversion fluorescence under 980 nm laser excitation; these features were favorable for the multiple labeling in biological detection. (c) 2007 Elsevier B.V. All rights reserved.
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