Journal
JOURNAL OF RARE EARTHS
Volume 36, Issue 10, Pages 1060-1066Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jre.2018.01.025
Keywords
Synthesis; Phase transformation; Controlled size; Nucleation and growth mechanisms; Upconversion luminescence; Rare earths
Categories
Funding
- National Natural Science Foundation of China [2126016]
- Science and Technology Innovation Guidance Project, Inner Mongolia, China [000-21090179]
- Talents Project Inner Mongolia [CYYC: 5026]
- State Key Laboratory on Integrated Optoelectronics (China) [IOSKL2013KF08]
- Graduate Student Scientific Research Foundation of Inner Mongolia [S20161013505]
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Near-monodisperse NaYF4:Yb/Er nanoparticles (NPs) with controlled size, phases (alpha, beta) and shapes (sphere, and hexagonal plate) were synthesized by adjusting the NaF to RE (RE = Y, Yb, Er) ratios, the reaction temperature and time in the hot surfactant solutions (oleic acid, 1-octadecene) from the improved one-pot thermal decomposition metal trifluoroacetate, and the precursors were prepared via hydrothermal route. The growth kinetics of beta-NaYF4 NPs includes several stages: nucleation, growth of alpha-NaYF4, Ostwald ripening, size shrinkage and growth. The results prove that the temperatures are preferred to the phase transformation compared with the NaF content when other experimental conditions are unchanged. Our work will further facilitate the comprehension of the nucleation and growth mechanisms of the NPs, and provide guidance for their controlled synthesis. (C) 2018 Published by Elsevier B.V. on behalf of Chinese Society of Rare Earths.
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