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Solvothermal Route to Colloidal Upconverting NaYF4: Yb3+/Er3+ and Yb3+/Tm3+ Nanocrystals

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Abstract:

Monodispersed nanocrystals of NaYF4: Yb3+, Er3+/Tm3+ that exhibited a high luminescence intensity were chemically synthesized by a non-aqueous solvothermal approach. These nanocrystals were easily dispersed in non-polar solvent and subsequently formed a transparent colloidal solution. Under 980 nm NIR excitation, green and blue emissions were observed from colloidal solutions of the NaYF4: Yb3+, Er3+/Tm3+, respectively. The effects of different solvents used and solvent concentration on the shape, size and size distribution of the nanocrystals have been investigated. It has been revealed that the doping ions diffused into NaYF4 lattice, and they formed a solid solution. The fluorescence photos, spectra, luminescence mechanism, and the formation mechanism of the nanocrystals have also been demonstrated. Emission spectrums of the nanocrystals prepared by this method show much more complicated emission peaks than by other methods.

Keywords: CRYSTALLINE; SODIUM YTTRIUM FLUORIDE; SOLVOTHERMAL SYNTHESIS

Document Type: Research Article

DOI: http://dx.doi.org/10.1166/jnn.2009.422

Publication date: March 1, 2009

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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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