Polyol-mediated synthesis and luminescence of lanthanide-doped NaYF4 nanocrystal upconversion phosphors
2007; Elsevier BV; Volume: 455; Issue: 1-2 Linguagem: Inglês
10.1016/j.jallcom.2007.01.107
ISSN1873-4669
AutoresWei Yang, Fengqi Lu, Xinrong Zhang, Depu Chen,
Tópico(s)Inorganic Fluorides and Related Compounds
ResumoPolyol 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 cubic-to-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.
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