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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.
High quality NaYF4: Eu3 + luminescent materials were successfully synthesized via a facile template technique by hydrothermal method. These samples were characterized by X-ray powder diffraction (XRD), transmission electron microscopy (TEM) and fluorescence spectroscopy (FS) 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.