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Solvothermal synthesis of monodisperse ultrasmall cubic-structure Ba2YbF7 nanocrystals with intense upconversion |
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| Authors: | Xu Changfu Ma Mo Zeng Songjun Ren Guozhong Yang Liwen Yang Qibin |
| Affiliation: | a Key Laboratory of Low Dimensional Materials &Application Technology of Ministry of Education, Xiangtan University, Xiangtan 411105, China b Institute of Modern Physics, Faculty of Material & Photoelectronic Physics, Xiangtan university, Xiangtan 411105, China c Laboratory for Quantum Engineering and Micro-Nano Energy Technology and Faculty of Materials and Optoelectronic Physics, Xiangtan University, Hunan 411105, China |
| Abstract: | A series of monodisperse ultrasmall Ba2YbF7 nanocrystals with intense upconversion emission were synthesized via a facile solvothermal method by using oleic acid as capping ligands. X-ray diffraction (XRD) and transmission electron microscopy (TEM) assays revealed that the as-synthesized Ba2YbF7 nanocrystals are of cubic structure, rather than the reported tetragonal structure. The cell parameter of the particles is 5.918 Å. The Er3+ or Tm3+ doped Ba2YbF7 nanocrystals with the size of sub-10 nm can give an intense upconversion emission under the 980 nm laser excitation and the upconversion processes were discussed. The Ba2YbF7 nanocrystals show a potential application as a bioimaging agent. |
| Keywords: | Ba2YbF7 nanocrystal Ultrasmall Upconversion Monodisperse |
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