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Charge transfer bands in optical materials and related defect level location

机译:光学材料中的电荷转移带及相关的缺陷水平定位

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摘要

Charge transfer (CT)-bands, electron trapping, hole trapping, electron release, hole release, metal-to metal-charge transfer, CT-luminescence, anomalous emission, impurity trapped exciton emission, inter-valence charge transfer, pair-emission, tunneling, photo-electron spectroscopy, redox potentials, photo-ionization, thermal-ionization. All these phenomena deal with the transfer of an electron from one atom in a compound to either another atom in the compound or to the ambient, i.e., outside the compound. The energy needed for, or released in, such transfer carries information on the electron binding energy in the defect levels with respect to the host band levels or the levels in the ambient. First the different types of charge transfer between a lanthanide and the host bands, and how they can be used to construct a host referred binding energy (HRBE) diagram, are reviewed. Then briefly the chemical shift model is introduced in order to convert the HRBE diagram into a vacuum referred binding energy diagram (VRBE). Next charge transfer between transition metal elements and host bands and between Bi3+ and host bands are treated, and finally electron transfer from one defect to another and to the ambient. Illustrating examples are provided. (C) 2017 Elsevier B.V. All rights reserved.
机译:电荷转移(CT)带,电子俘获,空穴俘获,电子释放,空穴释放,金属间电荷转移,CT发光,反常发射,杂质俘获的激子发射,中间价电荷转移,成对发射,隧穿,光电子能谱,氧化还原电势,光电离,热电离。所有这些现象涉及电子从化合物中的一个原子转移至化合物中的另一个原子或转移至周围环境,即化合物外部。这种转移所需的或释放的能量携带着关于缺陷能级中相对于主带能级或环境能级的电子结合能的信息。首先,回顾了镧系元素和宿主带之间的不同类型的电荷转移,以及它们如何用于构建宿主参考结合能(HRBE)图。然后简要介绍化学位移模型,以将HRBE图转换为真空参考结合能图(VRBE)。处理过渡金属元素与主体能带之间以及Bi3 +与主体能带之间的下一次电荷转移,最后将电子从一个缺陷转移到另一个缺陷,再转移到周围环境。提供了说明性示例。 (C)2017 Elsevier B.V.保留所有权利。

著录项

  • 来源
    《Optical Materials》 |2017年第7期|8-22|共15页
  • 作者

    Dorenbos Pieter;

  • 作者单位

    Delft Univ Technol Fac Sci Appl Dept Radiat Sci & Technol FAME LMR Mekelweg 15 NL-2629 JB Delft Netherlands;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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