Hydrothermal synthesis of SrF_2:Yb~(3+)/Er~(3+) micro-/nanocrystals with multiform morphologies and

• 作 者: 孙家跃 先建波 张翔燕 杜海燕
• 机 构: College of Chemistry and Environmental Engineering,Beijing Technology and Business University,
• 出 处: Journal of Rare Earths
• 发表日期: 2011年01期
• 关键词: cubic spherical hierarchical shaped facile infra surfactant oleic fluoride intri

Micro-and nanocrystals cubic-phase SrF2:Yb3+/Er3+ 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 transform 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:Yb3+/Er3+.The possible formation mechanisms for products with various architectures were presented.A systematic study on the photoluminescence of Yb3+/Er3+-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.

Micro-and nanocrystals cubic-phase SrF2: Yb3 + / Er3 + upconversion luminescence phosphors were synthesized via a facile hydro-thermal route in the presence of different surfactants. These samples were characterized with X-ray diffraction (XRD), Fourier transform 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- 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: Yb3 + / Er3 +. The possible formation mechanisms for products with various architectures were presented. A systematic study on the photoluminescence of Yb3 + / Er3 + -doped SrF2 samples with cubic shape, microspheres, spherical and nanosheets shape s showed that the optical properties of these products were strongly dependent on their morphologies and size.