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首页> 外文期刊>Crystal growth & design >Average Structure, Local Structure, Photoluminescence, and NLO Properties of Scheelite Type NaCe(WO4)(2)
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Average Structure, Local Structure, Photoluminescence, and NLO Properties of Scheelite Type NaCe(WO4)(2)

机译：平均结构，局部结构，光致发光和硅藻土型NACE（WO4）（2）的NLO性质

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Phase pure nanoparticles of NaCe(WO4)(2) green phosphor were synthesized via a template-free solvothermal method using water (NaCeW-a) and ethylene glycol (NaCeW-b) as reaction solvents. Rietveld refinements using powder neutron diffraction (NPD) data confirms that both NaCeW-a and NaCeW-b crystallize in the Scheelite-like tetragonal I4(1)/a space group. However, local structure analysis using total scattering atomic pair distribution function (PDF) refinements in a shorter 'r' range (1.5 to 10 angstrom) established the noncentrosymmetric I (4) over bar space group where Na/CeO8 polyhedra are slightly distorted, distributed in 2b and 2d sites. The interesting observation of noncentrosymmetry locally in both NaCeW-a and NaCeW-b is supported by optical nonlinear second harmonic generation (SHG) measurements. Closer inspection of the scanning electron micrograms showed a distinct difference in the particle morphology as a function of reaction solvent. Observation of the +3 valence state of the cerium ion in NaCe(WO4)(2) via X-ray photoelectron spectroscopy measurements was further corroborated by magnetic (VSM) measurements. In addition, both the samples emitted bright narrow green emission upon UV excitation with no considerable change in emission intensity with respect to solvent. Hence, the sharp green light emission and SHG properties make the NaCe(WO4)(2) a potential candidate for solid state display and nonlinear optical applications.
机译：使用水（NACEW-A）和乙二醇（NACEW-B）作为反应溶剂，通过无模板的溶剂（NACEW-B）合成NACE（WO4）（2）绿磷光体的相纯纳米粒子。使用粉末中子衍射（NPD）数据的RIETVELD改进证实，NACEW-A和NACEW-B两者均在白钨矿四方I4（1）/空间组中结晶。然而，使用总散射原子对分布函数（PDF）改进的局部结构分析在较短的“R”范围（1.5至10埃）建立了非中心体对称I（4）上方的条形空间组，其中Na / CeO8多面体略微扭曲，分布式在2b和2d站点。通过光学非线性二次谐波产生（SHG）测量，支持NACEW-A和NACEW-B中局部非康多斯对称的有趣观察。扫描电子显微图的仔细检查显示颗粒形态的明显差异作为反应溶剂的函数。通过磁性（VSM）测量进一步证实了通过X射线光电子体光谱测量的NACE（WO4）（2）中铈离子的+3价状态。此外，样品均在紫外线激发时发出明亮的窄绿色发射，不具有相对于溶剂的发射强度的显着变化。因此，尖锐的绿光发射和SHG性能使NACE（WO4）（2）固态显示器和非线性光学应用的潜在候选者。

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  • 来源
    《Crystal growth & design》 |2019年第11期|共10页
  • 作者

    Munirathnappa Archana K.; Neuefeind Joerg C.; Yanda Premakumar; Sundaresan A.; Kityk I. V; Ozga K.; Jedryka J.; Poornesh P.; Rao Ashok; Sundaram Nalini G.;

  • 作者单位

    Poornaprajna Inst Sci Res Mat Sci Div Bengaluru 562110 Karnataka India;

    Oak Ridge Natl Lab Chem &

    Engn Mat Div POB 2009 Oak Ridge TN 37831 USA;

    Jawaharlal Nehru Ctr Adv Sci Res New Chem Unit Chem &

    Phys Mat Unit PO Bengaluru Bengaluru 560064 Karnataka India;

    Jawaharlal Nehru Ctr Adv Sci Res New Chem Unit Chem &

    Phys Mat Unit PO Bengaluru Bengaluru 560064 Karnataka India;

    Czestochowa Tech Univ Fac Elect Engn Inst Optoelect &

    Measuring Syst Armii Krajowej 17 PL-42201 Czestochowa Poland;

    Czestochowa Tech Univ Fac Elect Engn Inst Optoelect &

    Measuring Syst Armii Krajowej 17 PL-42201 Czestochowa Poland;

    Czestochowa Tech Univ Fac Elect Engn Inst Optoelect &

    Measuring Syst Armii Krajowej 17 PL-42201 Czestochowa Poland;

    Manipal Acad Higher Educ Manipal Inst Technol Dept Phys Manipal 576104 Karnataka India;

    Manipal Acad Higher Educ Manipal Inst Technol Dept Phys Manipal 576104 Karnataka India;

    Poornaprajna Inst Sci Res Mat Sci Div Bengaluru 562110 Karnataka India;

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