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首页> 外文期刊>The journal of physical chemistry, C. Nanomaterials and interfaces >Evidence of Trivalent Europium Incorporated in Anatase TiO2 Nanocrystals with Multiple Sites
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Evidence of Trivalent Europium Incorporated in Anatase TiO2 Nanocrystals with Multiple Sites

机译：三价Euro掺入具有多个位点的锐钛矿型TiO2纳米晶体中的证据

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摘要

Trivalent europium ions have been successfully incorporated in anatase TiO2 nanocrystals via a sol—gel solvothermal synthesis, in spite of a large mismatch in ionic radius between Eu~(3+) and Ti~(4+). The photoluminescence intensity of Eu~(3+):TiO2 nanocrystals has been significantly improved, which is comparable to that of common red phosphors. Multiple sites of Eu~(3+) in TiO2 nanocrystals have been identified by the technique of site-selective spectroscopy. Eu~(3+) ions at two lattice sites exhibit sharp emission and excitation peaks with site symmetries descending from D_(2d) to approximate C_(2v) and D2 as a result of the lattice distortion, whereas Eu~(3+) ions at disordered site near the surface are analogous to Eu~(3+) ions located in a glasslike environment. Extended X-ray absorption fine structure is utilized for identifying the local structure and Eu~(3+) coordination. The luminescence dynamics and crystal-field levels of Eu~(3+) at different sites have been analyzed. A growth mechanism for the incorporation of Eu~(3+) in the anatase lattice is also suggested.
机译：尽管三价euro离子在Eu〜（3+）和Ti〜（4+）之间的离子半径存在很大的不匹配，但已经通过溶胶-凝胶溶剂热合成成功地将三价euro离子掺入了锐钛矿型TiO2纳米晶体中。 Eu〜（3 +）：TiO2纳米晶体的光致发光强度得到了显着提高，与普通的红色磷光体相当。 TiO2纳米晶体中Eu〜（3+）的多个位点已通过位点选择性光谱技术进行了鉴定。由于晶格畸变，两个晶格位点处的Eu〜（3+）离子显示出尖锐的发射峰和激发峰，位点对称性从D_（2d）下降到近似C_（2v）和D2，而Eu〜（3+）离子在表面附近的无序位置处的类似物类似于位于玻璃状环境中的Eu〜（3+）离子。利用扩展的X射线吸收精细结构来识别局部结构和Eu〜（3+）配位。分析了不同位置Eu〜（3+）的发光动力学和晶体场能级。还提出了在锐钛矿晶格中掺入Eu〜（3+）的生长机理。

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