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首页> 外文期刊>Optical Materials >Structural, electronic and photoluminescence properties of Eu3+-doped CaYAlO4 obtained by using citric acid complexes as precursors
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Structural, electronic and photoluminescence properties of Eu3+-doped CaYAlO4 obtained by using citric acid complexes as precursors

机译：以柠檬酸络合物为前体获得的掺Eu3 +的CaYAlO4的结构，电子和光致发光性能

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The search for new materials that meet the current technological demands for photonic applications, make the Rare Earth ions embedded in inorganic oxides as excellent candidates for several technological devices. This work presents the synthesis of Eu3+-doped CaYAlO4 using citric acid as ligand to form a complex precursor. The methodology used has big draw due to its easy handling and low cost of the materials. The thermal analysis of viscous solutions was evaluated and the obtained compounds show the formation of a polycrystalline tetragonal phase. Rietveld refinement was used to understand the structural and the cell parameters of the crystalline phase as a function of temperature of heat treatment. Crystallite size and microstrain were determined and were shown to have a direct relationship with the temperature of the heat-treatment. The band-gap of the CaYAlO4 doped with 1 and 10 mol % of Eu3+ showed values close to 4.30 eV, resulting in their transparency in the visible region between 330 and 750 nm. Besides the intense photoluminescence from Eu3+, a study was conducted to evaluate the possible position of the Eu3+ in the CaYAlO4 as host lattice. Lifetime of the emission decay from Eu3+ excited state D-5(0) show that CaYAlO4 is a good host to rare earth ions, once it can avoid clustering of these ions in concentration as high as 10 mol%. The predictions of the sublevels of the F-7(1) crystal field level are discussed through the method of equivalent nearest neighbours (MENN). The intensity parameters (Omega(lambda), lambda = 2 and 4) are reproduced with physically reasonable values of average polarizabilities. The set of charge factors used in both calculations are in good agreement with the charge of the europium ion described by the Batista-Longo improved model (BLIM). The quantum efficiencies of the materials were calculated based on Judd-Ofelt theory. Based on the results obtained in this work, the materials have potential use in photonic devices such as lasers and solid state imaging devices in the red region of electromagnetic spectrum. (C) 2016 Elsevier B.V. All rights reserved.
机译：寻找满足当前光子应用技术要求的新材料，使嵌入无机氧化物中的稀土离子成为多种技术设备的理想选择。这项工作提出了使用柠檬酸作为配体形成复杂的前驱体的Eu3 +掺杂的CaYAlO4的合成。由于其易于处理且材料成本低廉，因此所使用的方法具有很大的吸引力。评价了粘性溶液的热分析，所得化合物显示出多晶四方相的形成。 Rietveld精炼用于了解晶相的结构和晶胞参数与热处理温度的关系。确定了微晶尺寸和微应变，并显示出其与热处理温度有直接关系。掺杂有1和10 mol％的Eu3 +的CaYAlO4的带隙显示值接近4.30 eV，从而导致它们在330和750 nm之间的可见光区域透明。除了来自Eu3 +的强光致发光外，还进行了一项研究，以评估Eu3 +在作为主晶格的CaYAlO4中的可能位置。 Eu3 +激发态D-5（0）的发射衰变的寿命表明，CaYAlO4是稀土离子的良好宿主，一旦它可以避免浓度高达10 mol％的这些离子聚集。通过等效最近邻（MENN）方法讨论了F-7（1）晶体场能级的能级预测。以物理上合理的平均极化率值再现强度参数（Ω，λ= 2和4）。两种计算中使用的一组电荷因数与由Batista-Longo改进模型（BLIM）描述的the离子的电荷高度吻合。根据Judd-Ofelt理论计算了材料的量子效率。基于这项工作中获得的结果，该材料在电磁光谱的红色区域中可潜在地用于光子设备，例如激光器和固态成像设备。 （C）2016 Elsevier B.V.保留所有权利。

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