Synthesis, multicolour tuning, and emission enhancement of ultrasmall LaF3:Yb3+/Ln3+ (Ln = Er, Tm, and Ho) upconversion nanoparticles
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- 作者：Xiaoyong Huang
- 刊名：Journal of Materials Science
- 出版年：2016
- 出版时间：April 2016
- 年：2016
- 卷：51
- 期：7
- 页码：3490-3499
- 全文大小：3,664 KB
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1. Key Lab of Advanced Transducers and Intelligent Control System, Ministry of Education and Shanxi Province, College of Physics and Optoelectronics, Taiyuan University of Technology, Taiyuan, 030024, People’s Republic of China - 刊物类别：Chemistry and Materials Science
- 刊物主题：Chemistry
Materials Science
Characterization and Evaluation Materials
Polymer Sciences
Continuum Mechanics and Mechanics of Materials
Crystallography
Mechanics - 出版者：Springer Netherlands
- ISSN：1573-4803
文摘
The development of efficient sub-10 nm ultrasmall upconversion nanoparticles will open the door to the exciting application in biological labelling and imaging. In this paper, we demonstrated a facile method for the synthesis of monodisperse sub-10 nm hexagonal-phased LaF3 nanoparticles doped with upconverting lanthanide ions (Yb3+/Ln3+, Ln = Er3+, Tm3+, and Ho3+). The particle size of the as-synthesized LaF3 nanoparticles can be tuned by varying the preparation temperature. Upon excitation at 980 nm, the LaF3:Yb3+/Ln3+ nanoparticles showed intense upconversion emissions, and the colour output can be precisely modulated by changing the species and concentration of the lanthanide activators. In order to further enhance the upconversion emission intensity of the ultrasmall LaF3:Yb3+/Ln3+ nanoparticles, we adopted the strategy of core–shell nanostructured design to minimize the surface quenching effect. After coating an inert LaF3 shell, a maximum ninefold enhancement in upconversion luminescence was achieved under 980 nm excitation. These as-prepared lanthanide-doped LaF3 upconversion nanoparticles may find promising applications in biomedicine fields as luminescent nanoprobes.