Citation: YU Feng, HUANG Zhou-Xia, MA Mo, XU Chang-Fu, LIN Jian-Guo. Synthesis and Upconversion Luminescence of Ultrasmall YF3 and GdF3 Nanocrystallines[J]. Chinese Journal of Inorganic Chemistry, ;2014, 30(4): 805-810. doi: 10.11862/CJIC.2014.128
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In liquid-solid-solution (LSS) method, when NaOH in the traditional oleic acid/sodium oleate/alcohol reaction system was replaced by ammonia, ammonia reacted with oleic acid, and then a new kind surfactant generated. So, this method can be used to synthesize monodispersed ultrasmall REF3 nanocrystals. In this new reaction system, ultrasmall YF3 and GdF3 nanocrystals have been synthesized. X-ray diffraction (XRD) and transmission electron microscopy (TEM) assays revealed that the as-synthesized YF3 was orthorhombic structure, but GdF3 was face-centered cubic phase (S. G.: Fm3m, lattice constant: 0.5829 nm). Under the excitation of 980 nm diode laser, strong green photoluminescence at 515~570 nm and strong red emission at 645~675 nm of YF3:Yb/Er were detected, so the luminescent color of YF3:Yb/Er nanocrystals presented orange. Intense blue emission peaks at 460~490 nm from YF3:Yb/Tm and GdF3:Yb/Tm nanocrystals were detected, especially the stronger near-infrared photoluminescence peaks near 800 nm. For the ultrasmall size and its relative strong upconversion luminescence, the as-synthesized samples show potential applications in bioimaging, biolabels and etc.
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