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Synthesis and Upconversion Luminescence of NaYF4:Yb3+,Tm3+/TiO2 Nanocrystal Colloidal Solution

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Abstract:

NaYF4:Yb3+,Tm3+ upconversion nanocrystals were synthesized with oleic acid as a capping ligand. The as-prepared samples were redispersed in cyclohexane, forming transparent and stable solutions which perform bright blue upconversion. Inducing TiO2 as the outer layer of the fluoride cores, we investigated the effect of TiO2 on the upconversion process. The transmission electron microscopy (TEM) analysis indicated that titania successfully formed a coating layer on the surface of NaYF4:Yb3+,Tm3+ nanoparticles, and the average diameters of the NaYF4:Yb3+,Tm3+ nanocrystals and the NaYF4:Yb3+,Tm3+/TiO2 nanoparticles are about 14 and 40 nm, respectively. Under the excitation of a 980 nm laser, NaYF4:Yb3+,Tm3+ nanocrystals and TiO2-coated NaYF4:Yb3+,Tm3+ core/shell structure sample exhibited distinct upconversion luminescent properties.

Keywords: LUMINESCENCE; NANOCRYSTAL; NAYF4; UPCONVERSION

Document Type: Research Article

DOI: http://dx.doi.org/10.1166/jnn.2010.2133

Publication date: March 1, 2010

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  • Journal for Nanoscience and Nanotechnology (JNN) is an international and multidisciplinary peer-reviewed journal with a wide-ranging coverage, consolidating research activities in all areas of nanoscience and nanotechnology into a single and unique reference source. JNN is the first cross-disciplinary journal to publish original full research articles, rapid communications of important new scientific and technological findings, timely state-of-the-art reviews with author's photo and short biography, and current research news encompassing the fundamental and applied research in all disciplines of science, engineering and medicine.
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