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首页> 外文期刊>Optical Materials >Facile synthesis of Sm3+/Eu3+ codoped CeO2 ultrafine nanocrystals and oxygen vacancy site dependent photoluminescence
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Facile synthesis of Sm3+/Eu3+ codoped CeO2 ultrafine nanocrystals and oxygen vacancy site dependent photoluminescence

机译：轻松合成Sm3 + / Eu3 +共掺杂CeO2超细纳米晶体和氧空位依赖的光致发光

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Ultrafine nanocrystals of Sm3+/Eu3+ codoped CeO2 have been prepared successfully by a simple and facile oxalate decomposition method. The structure, phase and size of the nanocrystals were characterized by X-ray diffraction and transmission electron microscope which confirmed that monodispersed nanocrystals of size below 5 nm are formed by this novel technique. Spectroscopic investigations of the synthesized phosphors are carried out with the help of photoluminescence excitation, emission and decay analysis. The studies revealed that oxygen vacancies introduced in the crystal lattice for charge compensation strongly influences the luminescence properties of the phosphor material. By investigating the luminescence characteristics of the material with different doping concentrations of Sm3+ and Eu3+, the position of the oxygen vacancies with respect to the dopant ion is determined. Also it can be revealed that symmetry of Eu3+ ions are perturbed by the oxygen vacancies at nearest neighbor site which produce strong electric dipole transition emissions in the luminescence spectra. In the case of Sm3+ ions oxygen vacancies are repelled to the next nearest neighbor site and hence the cubic symmetry of the ions is preserved. In addition, occurrence of non radiative energy transfer from Sm3+ to Eu3+ in the phosphor material is confirmed by the close examination of the luminescence spectra. Chromaticity coordinates evidenced that color purity of the synthesized nanophosphors is marginally increased by the proper addition of Sm3+. (C) 2015 Elsevier B.V. All rights reserved.
机译：通过简单，简便的草酸盐分解方法已成功制备了Sm3 + / Eu3 +共掺杂CeO2的超细纳米晶体。通过X射线衍射和透射电子显微镜表征了纳米晶体的结构，相和尺寸，这证实了通过这种新技术形成了尺寸小于5nm的单分散纳米晶体。在光致发光激发，发射和衰减分析的帮助下对合成的磷光体进行了光谱研究。研究表明，为了补偿电荷而引入晶格中的氧空位极大地影响了磷光体材料的发光性能。通过研究具有不同掺杂浓度Sm3 +和Eu3 +的材料的发光特性，可以确定氧空位相对于掺杂剂离子的位置。还可以揭示，Eu3 +离子的对称性受到最近邻位处的氧空位的干扰，氧空位在发光光谱中产生强电偶极跃迁发射。在Sm3 +离子的情况下，氧空位被排斥到下一个最近的相邻位点，因此保留了离子的立方对称性。另外，通过仔细检查发光光谱可以确认在荧光体材料中发生了从Sm3 +到Eu3 +的非辐射能量转移。色度坐标表明，适当添加Sm3 +可以稍微提高合成纳米磷的色纯度。 （C）2015 Elsevier B.V.保留所有权利。

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