Micro- and nanocrystals cubic-phase SrF2：yb^3＋/Er^3＋ upconversion luminescence phosphors were synthesized via a facile hydro- thermal route in the presence of different surfactants. The samples were characterized w...
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Micro- and nanocrystals cubic-phase SrF2：yb^3＋/Er^3＋ upconversion luminescence phosphors were synthesized via a facile hydro- thermal route in the presence of different surfactants. The samples were characterized with X-ray diffraction （XRD）, Fourier transtbrm infra- red spectra （FT-IR）, scanning electron microscopy （SEM）, transmission electron microscopy （TEM）, and upconversion emission spectra. As-prepared products showed a variety of morphologies, such as cubic-shaped microcrystal, hierarchical structure microspheres, spheri- cal-shaped nanocrystals and nanosheets. The intrinsic structural feature of cubic-phase SrF2 and two important external factors, namely, the surfactants in the reaction solution and fluoride sources, were responsible for shape determination of SrF2：yb^3＋/Er^3＋. The possible formation mechanisms for products with various architectures were presented. A systematic study on the photoluminescence of yb^3＋/Er^3＋-doped SrF2 samples with cubic shape, microspheres, spherical and nanosheets shapes showed that the optical properties of these products were strongly dependent on their morphologies and size.
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