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arXiv 1403.0977cond-mat.mtrl-sci
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Li+共掺杂对Ba2GdNbO6:Eu3 +钙钛矿发光的增强机理

Mechanism of luminescent enhancement in Ba2GdNbO6:Eu3+ perovskite by Li+ co-doping

Marcos Vinicius dos Santos Rezende, Mario Ernesto Giroldo Valério, Rodolpho Mouta, Eduardo Moraes Diniz, Carlos William de Araújo Paschoal

摘要:

采用基于能量最小化的原子模拟方法研究了Li+离子在Ba 2GdNbO 6:Eu 3+钙钛矿中的掺入。我们预测了Eu 3+和Li+离子最可能占据的位置以及这些取代所涉及的相关电荷补偿机制。结果表明,Eu ~(3+)和Li ~(3+)离子主要在Gd ~(3+)位掺入。在Li+离子的情况下,存在Nb_Gd反位的电荷补偿。根据模拟的Eu ~(3+)格位的局域对称性,计算了BGN:Eu ~(3+)晶体中Eu ~(3+)离子的晶场参数和跃迁能级。结果表明,Li+共掺杂引起的对称性畸变是发光性能增强的主要机制。

英文摘要:

We investigated the Li+ ion incorporation in Ba2GdNbO6:Eu3+ perovskite by atomistic simulations based on energy minimization. We predicted the most probable sites occupied by Eu3+ and Li+ ions and the related charge-compensation mechanisms involved into these substitutions. The results show that the Eu3+ and Li+ ions are incorporated mainly at the Gd3+ site. In the Li+ ion case, there is a charge compensation by Nb_Gd antisite. The Crystal field parameters and the transition levels for the Eu3+ ion in the BGN:Eu3+ were calculated with basis on the simulated local symmetry of the Eu3+ site. The results show that the mechanism of luminescent properties enhancement is the symmetry distortion induced by the Li+ co-doping.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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