The Controllable Synthesis and Luminescent Properties of ScF3, NaScF4, (NH4)2NaScF6 Nanaocrysals
ZHANG Li-gang1，2, ZHAO Su-ling1*, XU Zheng1, ZHU Wei1, BAI Yong-qing2, QU Jiao2, FAN Hong2
1. Key Laboratory of Luminescence and Optical Information (Beijing Jiaotong University), Ministry of Education, Institute of Optoelectronics Technology, Beijing Jiaotong University, Beijing 100044, China
2. School of Science, Hebei University of Architecture，Zhangjiakou 075000，China
Abstract：Scandium fluoride possess chemical stability, with low phonon energy and low potential cytotoxicity, is a new type of high efficient based material, and also distance between Sc3+-Sc3+ ions is also lower. Thus it has more peculiar physical and chemical properties, recently. Recently, Scandium fluoride codoped with Yb3+/Er3+have attracted significant interest and become study hot fields. In the paper, using Polyetherimide (PEI) as surfactant, a series ScF3∶Yb3+/Er3+, NaScF4∶Yb3+/Er3+, (NH4)2NaScF6∶Yb3+/Er3+ nanocrystals were prepared at 200 ℃ by a facile hydrothermal method. By X-ray diffraction (XRD), Transmission electron microscopy (TEM), Scanning electron microscope (SEM) and fluorescence spectrometer, the crystal phase, morphology and luminescent characteristics of prepared samples were investigated. The results showed that the product, phase and morphology of sample can be tailored through varying the ratio of NH4F/Ln3+ (NH4F/Ln3+=1∶1, 2∶1, 2. 5∶1, 3∶1, 4∶1, 6∶1, 10∶1, 20∶1, 30∶1, 40∶1, 50∶1). When the NH4F/Ln3+ ratio were 2.5∶1, the pure cubic phase ScF3 was obtained. When NH4F∶Ln3+ ratio was 4∶1, the hexagonal phases NaScF4 was obtained. When the NH4F∶Ln3+ ratio was 40∶1, the products were changed to pure cubic phase (NH4)2NaScF6. The TEM and the SEM showed that the crystallinity of samples was high and the particle size was uniform. The morphology were square nano piece and polyhedron of football shape in different ratio of NH4F/Ln3+. Meanwhile, the UC fluorescence emission spectra were measured. The color of UC emission were tuned from orange to red, green and yellow in samples by adjusting the ratio of NH4F/Ln3+. It turned out that just change NH4F one raw materials dosage, can generate ScF3∶Yb3+/Er3+, NaScF4∶Yb3+/Er3+, (NH4)2NaScF6∶Yb3+/Er3+ three different kinds of products, which illustrate that NH4F dosage has decisive effect to the type of products. The UC emission intensity and out colour can be also significantly influenced by the ratio of NH4F/Ln3+.
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