镧-铕-铒-钙-钒酸盐纳米晶中铕的强发光，共掺杂优化的结果
Strong europium luminescence in lanthan-euripium-erbium-calcium-vanadate nanocrystals, the result of codoping optimization
摘要：
合成并研究了钙、铕、铒离子共掺杂的钒酸镧纳米晶，旨在阐明钙、铒杂质对铕离子发光的影响机理，寻找具有增强发光强度的组分。XRD分析揭示了晶体结构对掺杂浓度的依赖性：在低掺杂浓度下观察到单斜晶相，并且随着掺杂浓度的增加，四斜晶相的含量增加。SEM研究揭示了具有两种类型的形状的纳米颗粒的形成。光致发光光谱由铒和铕离子内部跃迁引起的谱线组成。结果表明，铕离子发光强度与钙、铒浓度的关系是由于掺杂对晶格结构、铕离子第一配位层缺陷和激发能转移效率的累积效应所致。
英文摘要：
Co-doped with calcium, europium and erbium ions lanthanum vanadate crystalline nanoparticles are synthesized and investigated with a goal to clarify the mechanisms of calcium and erbium impurities effects on europium ions luminescence and to find compositions with enhanced luminescence intensity. The XRD analysis reveals dependence of crystal structure on dopants concentration: monoclinic crystal phase is observed for low dopant concentrations and content of tetragonal crystal phase increases with dopant concentrations increase. The SEM investigation reveals formation of nanoparticles with two types of shapes. Photoluminescence spectra consist of lines caused by inner transitions in the erbium and europium ions. It has been shown that dependence of the europium ions luminescence intensity on the calcium and erbium concentrations is caused by cumulative effects of dopants on crystal lattice structure, on defects in the first coordination sphere of the europium ions and on efficiency of excitation energy transfer.
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