Synthesis of Monodisperse NaYF4:Yb, Tm@SiO2 Nanoparticles with Intense Ultraviolet Upconversion Luminescence
In this paper, the NaYF4:Yb, Tm upconversion (UC) nanoparticles (NPs) were synthesized using a solvothermal approach, and the core–shell structured NaYF4:Yb, Tm@SiO2 NPs, coated with a thin layer of SiO2 on the surface of the NaYF4:Yb, Tm NPs, were prepared by a typical Stöber method. X-ray diffraction (XRD), transmission electron microscopy (TEM), and luminescence spectroscopy were applied to characterize these samples. The obtained core–shell structured NaYF4:Yb, Tm@SiO2 NPs exhibited a perfect spherical morphology with narrow size distribution and smooth surfaces. Under 980 nm excitation, NaYF4:Yb, Tm and NaYF4:Yb, Tm@SiO2 samples showed intense ultraviolet UC luminescence, which originated from the 1D2 → 3H6, 1I6 → 3F4 transitions of Tm3+. These NPs have great potential for applications as fluorescent labels, imaging probes, optical storage, photodynamic therapy (PDT) in deep tissue, and solid-state lasers.
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Document Type: Research Article
Publication date: 2011-11-01
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