| Author Name | Affiliation | | QU Yu-qiu | School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China
College of Physics Science and Technology, Heilongjiang University, Harbin 150080, China | | LI Mei-cheng | School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China | | ZHAO Lian-cheng | School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China |
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| Abstract: |
| LaF3∶[KG-*2]Yb3+, Er3+ nanoparticles were successfully synthesized using solvothermal treatment, and LaF3∶[KG-*2]Yb3+, Er3+／SiO2 core／shell nanoparticles were also prepared with reverse microemulsion technique. The crystal structure, morphology and photoluminescence properties of as-prepared core／shell nanoparticles were investigated by X-ray diffraction, transmission electron microscopy and fluorescence spectrophotometer. The results showed that LaF3∶[KG-*2]Yb3+, Er3+ nanoparticles are of hexagonal structure and SiO2 shell is amorphous. The size of LaF3∶[KG-*2]Yb3+, Er3+ nanoparticles is 13 nm and the LaF3∶[KG-*2]Yb3+, Er3+／SiO2 nanoparticles present clearly a core／shell structure with 12 nm shell thickness. The solubility of LaF3∶[KG-*2]Yb3+, Er3+ nanocrystals in water and the biocompatibility are both improved by the SiO2 shell. The upconversion luminescence spectra suggested that the SiO2 shell has small effect on the upconversion luminescence properties of the LaF3∶[KG-*2]Yb3+, Er3+ nanocrystals. The core／shell structure LaF3∶[KG-*2]Yb3+, Er3+／SiO2 nanoparticles are expected to be used in biological applications. |
| Key words: LaF3∶[KG-*2]Yb3+, Er3+／SiO2 nanocomposites core／shell structure upconversion luminescence |
| DOI：10.11916/j.issn.1005-9113.2012.03.013 |
| Clc Number:O61433 |
| Fund: |
