超一般化梯度近似依赖时间密度函数理论研究 Hf-和 Zr-doped 氧化中电子的捕获:影响氧空缺
1Faculty of Chemistry, University of Wrocław, 14 F. Joliot-Curie, Wrocław, Lower Silesia 50-383, Poland.
概括
哈夫尼 (Hf) 或 (Zr) 兴奋剂显著影响立方氧化物 (c-Lu2O3) 中氧空缺的电子捕获,影响热发光和储能能力.
科学领域:
- 材料科学 材料科学 材料科学
- 固态物理 固态物理
- 计算化学计算化学
背景情况:
- 用Hf或Zr合的立方氧化物 (c-Lu2O3) 体表现出热发光和能量储存.
- 氧气空缺是这些的关键缺陷点,影响它们的电子性质.
- 了解剂空缺相互作用是优化性能的关键.
研究的目的:
- 为了研究附近的Hf或Zr剂对c-Lu2O3中氧空位点的电子密度的影响.
- 为了确定多潘特的接近如何影响被困电子的光学陷深度.
- 阐明电子激发和被化c-Lu2O3中的捕获机制.
主要方法:
- 使用了时间依赖密度函数理论 (TD-DFT) 的计算.
- 分析电子密度分布在氧气空隙周围的分析,并没有附近的剂.
- 缺陷结构的建模,包括多潘酸,氧空缺和间歇氧 (弗伦克尔对).
主要成果:
- 剂的近距离显著改变了光学陷深度:相对于孤立的空隙 (1.6-1.7 eV),附近的剂将其增加到2.0-2.1 eV.
- 电子激发可以导致局部兴奋状态或电子转移到剂 (Hf).
- 具有零净电荷的复合缺陷 (多潘特+弗伦克尔对) 被确定为最可能的电子陷.
结论:
- 相对于氧气空缺的Hf或Zr补充剂的位置对c-Lu2O3中的电子捕获和光学特性产生了重大影响.
- 涉及dopants和空缺的复合缺陷是电子捕获的主要地点,对于热发光和能量储存至关重要.
- 计算建模为缺陷行为提供了洞察力,指导了先进光器的设计.
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