Journal
CRYSTAL GROWTH & DESIGN
Volume 9, Issue 4, Pages 2013-2019Publisher
AMER CHEMICAL SOC
DOI: 10.1021/cg801371r
Keywords
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Funding
- MOST of China [2006CB601104]
- NSFC [20871006, 20821091, 20671005]
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Uniform alkaline earth metal fluoride MF2 (M = Mg, Ca, and Sr) nanocrystals with various shapes (tetragonal MgF2 nanoneedle-constructed 3D networks; cubic CaF2 nanoplates and nanopolyhedra; cubic SrF2 nanoplates and nanowires) have been synthesized from the thermolysis of alkaline earth metal trifluoroacetate (M(CF3COO)(2)) in hot surfactant solutions (oleic acid, oleylamine, and I-octadecene). The MF2 nanocrystals were formed by the controlled fluorination of the M-O bond into the M-F bond at the nucleation stage and subsequent growth process. For phase-pure MF2 nanocrystals, the growth of shape-selective MF2 nanocrystals was likely due to the template direction of micellar structures formed by self-assembly of capping ligands and the so-called Ostwald ripening process. With the developed synthetic strategy, the uniform upconversion SrF2:Yb,Er and core/shell SrF2:Yb,Er@SrF2 nanocrystals were also obtained. The core/shell-structured nanocrystals exhibited enhanced emission intensity and saturation power with respect to their core counterparts, owing to the suppression of associated nonradiative decays.
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