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

作　　者：孙家跃 先建波 张翔燕 杜海燕 

机构地区：[1]College of Chemistry and Environmental Engineering,Beijing Technology and Business University

出　　处：《Journal of Rare Earths》2011年第1期32-38,共7页稀土学报（英文版）

基　　金：Project supported by the National Natural Science Foundations of China (20876002,20976002);Natural Science Foundation of Beijing (2082009,2091002);Funding Project for Academic Human Resources Development in Institutions of Higher Learning under the Jurisdiction of Beijing Municipality

摘　　要：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.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.

关 键 词：SrF2：yb^3＋/Er^3＋ morphology surfactant UPCONVERSION rare earths 

分 类 号：TB383.1[一般工业技术—材料科学与工程]