Publication date: 10th April 2014
Nowadays the demand to find new techniques for the facile synthesis of nanosized phosphors is increasing. Ultrasmall, monodispersed light-emitting nanomaterials have real and potential applications in solid-state lasers, bioimaging, optical data storage and 3D flat-panel displays. Recently it was reported that colloidal α- or β-phase NaYF4 hosts doped with RE (RE = Er, Yb, Ho or Tm) are the best candidates for biological applications [1]. However, there are only a few reports on a series of alkali-earth–rare-earth complex fluoride, xMF2–yRREF3 (M = Na, Ba, Sr), (R = Y, Gd), (RE = Er, Yb, Ho or Tm) ternary compounds [2]. It is expected that the alkali-earth–rare-earth complex fluorides have tetragonal and hexagonal phase structure and might possess highly efficient upconversion (UC) emission [3]. SrY2F7 have been selected, as the research object, because of its potential applicability as suitable host for biological applications, where one of the major requirements is nanoparticle size. As mentioned alkali-earth–rare-earth complex fluoride are promising host material for UCNPs, mainly because of low phonon energy. SrY2F7 particle size are dependent on the nucleation rate, which in turn, is governed from the reagents concentration, molar ratio, choice of capping ligand, reaction temperature and pH. SrY2F7 samples were synthesized using co-precipitation method. All samples were analyzed using X-Ray diffraction (XRD), scanning electron microscopy (SEM), dynamic light scattering (DLS) and infrared spectroscopy (FTIR). By tuning the ratio of Sr/Y/F, solvent composition, reaction temperature and time, it is possible to synthesize nanoparticles of different size and shape. Fluorine amount in starting mixture, synthesis temperature, pH and surfactant concentration influence for particle size and shape will be discussed.
References:
[1] M. Ma, Ch. Xu, L. Yang, Q. Yang, J. Lin, Journal of Alloys and Compounds, 2012,525, 97.
[2] P.P. Fedorov, A.A. Luginina, S.V. Kuznetsov, V.V. Osiko, Journal of Fluorine Chemistry, 2011, 132, 1012.
[3] Z. Xia, P. Du, L. Liao, Physica Status Solidi (a), 2013, 210, 1734
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