In this paper, submicro-scaled YF3 particles with uniform rice-like morphologies were facilely synthesized by reacting yttrium nitrate with tetrabutylammonium fluoride via a solid-state reaction process at 50 °C for 12 h.The phase confirmation and morphology of the as-prepared YF3 particles were investigated by X-ray powder diffraction(XRD) and scanning electron microscopy(SEM).SEM results reveal that the YF3 submicroparticles are about 700 nm in length and 260 nm in width. Eu3+and Tb3+doped YF3 submicroparticles were also prepared with similar process and their photoluminescence properties were studied. Results demonstrate that the doping of Eu3+and Tb3+has slight effect on the morphologies of the product. Owing to the small average crystallite size or the low crystallinity of the product, the photoluminescence intensity of the Eu3+and Tb3+doped YF3 submicroparticles is very weak. Some characteristic peaks even cannot be observed in the emission spectrum.
In this work,Eu(III)-based coordination polymer(EuCP) nanosheets were successfully synthesized using tetrabutylammonium bromide(TBAB) as low-temperature molten salt(LMS),terephthalic acid(PTA) and pyromellitic acid(PMA) as organic building blocks at 160℃.X-ray diffraction(XRD),Fourier transform infrared(FTIR),scanning electron microscopy(SEM),transmission electron microscopy(TEM) and thermogravimetry and differential thermal analysis(TG-DTA) were used to characterize the obtained products.Results show that the nanosheets have an average size of 200 nm and a thickness of about 50 nm.The effect of reaction temperature,reaction time and molar ratio of Eu^(3+)/PTA/PMA on the preparation was investigated.It turns out that all of them have great effect on morphology and size of the final product.When excited with 315 nm,strong emission centering at 617 nm is realized.Importantly,this synthetic methodology may offer a new alternative in the preparation of rare earth nanomaterials.
