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Effect of Eu-doping on optical, structural and morphological properties of BaI_2·nH_2O powders

机译：Eu掺杂对BaI_2·nH_2O粉末光学，结构和形貌特性的影响

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摘要

The two-step approach to the Eu2+ doped BaI2 center dot nH(2)O powders synthesis in Ar atmosphere from precursors containing different concentration of Eu3+ ions is reported. According to X-ray diffraction analysis the powders mainly consist of BaI2 center dot 2H(2)O phase. Their morphological, structural and luminescent properties depend on the Eu-ions concentration. The luminescence spectra are composed of broad and strong emission band peaking at 420 nm, which was related to the Eu2+ 5d-4f transition. Its intensity reaches maximum in the 2 at. % Eu2+ doped sample. Detailed analysis of the measured electron paramagnetic resonance spectra in the samples with different doping level confirms them belong to the Eu2+ ions substituting for the regular Ba2+ site in the Bale lattice. A sample exposed to the 330 nm UV irradiation exhibited an increase of the Eu2+ spectral intensity occurred exclusively due to the Eu3+ to Eu2+ transformation. No other signals either prior to or after the irradiation which might be attributed to the ions resided in e.g., interstitial positions or in any secondary phases were observed. Possible mechanisms of the Eu3+ stabilization in the host lattice with only divalent cation sites during the synthesis without additional treatment in reducing atmosphere are discussed as well. (C) 2018 Elsevier B.V. All rights reserved.
机译：报道了在Ar气氛中由含不同浓度Eu3 +离子的前驱体合成Eu2 +掺杂的BaI2中心点nH（2）O粉末的两步法。根据X射线衍射分析，粉末主要由BaI2中心点2H（2）O相组成。它们的形态，结构和发光特性取决于Eu离子浓度。发光光谱由在420 nm处出现的宽而强的发射带峰组成，这与Eu2 + 5d-4f跃迁有关。其强度在2 at处达到最大值。 ％Eu2 +掺杂的样品。对不同掺杂水平的样品中测得的电子顺磁共振光谱的详细分析证实，它们属于Eu2 +离子，取代了Bale晶格中的规则Ba2 +位点。暴露于330 nm紫外线照射的样品表现出Eu2 +光谱强度的增加是由于Eu3 +向Eu2 +的转化所致。在辐射之前或之后，没有观察到可能归因于离子的其他信号，例如驻留在间隙位置或任何第二相中。还讨论了在合成过程中仅在二价阳离子位点处没有在还原气氛中进行额外处理的Eu3 +稳定化的可能机制。 （C）2018 Elsevier B.V.保留所有权利。

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