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High quality NaYF4:Eu3+ luminescent materials were successfully synthesized via a facile template technique by hydrothermal method.The samples were characterized by X-ray powder diffraction(XRD),transmission electron microscopy(TEM) and fluorescence spectroscopy(FS).The incorporating of Eu3+ ions into NaYF4 crystal lattice influenced the symmetry types of NaYF4 crystals,resulting in phase transformation of NaYF4 crystals between α and β phase.The pure hexagonal phase of branched NaYF4:Eu3+ was obtained as the Eu3+ concentration reached 15 mol.%.In addition,the luminescence color was tuned by changing the doping concentration of Eu3+ ions. 相似文献
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采用溶胶-凝胶方法在纳米孔材料VSB-1的孔道中制备了二氧化钛的纳米颗粒.通过XRD,EDX,FTIR,UV-Vis和N2吸附等方法证实了纳米TiO2的确存在于VSB-1的孔道中.但当合成条件不同时,所得到产品的存在状态和性质也不同.主要研究了不同前驱体的浓度、不同的反应时间和不同尺寸的前驱体对产物的影响. 相似文献
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