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Issue 35, 2017
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Selective synthesis of LaF3 and NaLaF4 nanocrystals via lanthanide ion doping

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Abstract

The capability to selectively obtain expected nanocrystals from a series of possibilities with similar chemical compositions has been a long-term challenge. β-LaF3 and β-NaLaF4 nanocrystals are a kind of host material with excellent physical and chemical stability as well as low phonon energy. Since β-NaLaF4 nanocrystals are difficult to form due to the very strong La3+–F ionic bond, investigations of the doping effect of different lanthanide ions on the formation of the final product were carried out. The experimental results have indicated that Ce3+ and Pr3+ doping has no obvious effect on the product compared to pure β-LaF3 nanocrystals without doping, and doping of Nd3+, Sm3+, Eu3+, Gd3+, and Tb3+ leads to the formation of pure β-NaLaF4 nanocrystals while doping of Dy3+, Ho3+, Er3+, Tm3+, Yb3+, and Lu3+ only results in a mixture of both. What is more, proper lanthanide ion doping can also help in obtaining enhanced up- and downconversion luminescence. A theoretical model from the nanocrystal growth free energy point of view has been developed to explain the above phenomenon.

Graphical abstract: Selective synthesis of LaF3 and NaLaF4 nanocrystals via lanthanide ion doping

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Article information


Submitted
30 May 2017
Accepted
30 Jul 2017
First published
03 Aug 2017

J. Mater. Chem. C, 2017,5, 9188-9193
Article type
Paper

Selective synthesis of LaF3 and NaLaF4 nanocrystals via lanthanide ion doping

L. Nie, Y. Shen, X. Zhang, X. Wang, B. Liu, Y. Wang, Y. Pan, X. Xie, L. Huang and W. Huang, J. Mater. Chem. C, 2017, 5, 9188
DOI: 10.1039/C7TC02362F

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