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首页> 外文学位 >AN EXPERIMENTAL INVESTIGATION OF POINT DEFECTS AND MOTION OF CHARGE IN ALUMINUM OXIDE, MAGNESIUM OXIDE, AND STRONTIUM OXIDE (SAPPHIRE, COLOR CENTER, CARBORUNDUM, F CENTER).
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AN EXPERIMENTAL INVESTIGATION OF POINT DEFECTS AND MOTION OF CHARGE IN ALUMINUM OXIDE, MAGNESIUM OXIDE, AND STRONTIUM OXIDE (SAPPHIRE, COLOR CENTER, CARBORUNDUM, F CENTER).

机译：对氧化铝，氧化镁和氧化锶（蓝宝石，彩色中心，金刚砂，F中心）中的点缺陷和电荷运动进行实验研究。

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摘要

Scope of Study. The object of this study is to investigate the electronic structure, motion of charge, and trapping mechanisms in aluminum oxide, MgO, and SrO. Thermochemically colored, electron irradiated, neutron irradiated, and gamma irradiated single crystals are studied from 6 K to 300 K. A wide range of experimental techniques are used.;In MgO, the sample dependent 2.3 eV phosphorescence near room temperature is directly related to the concentration of H- ions trapped in oxygen vacancies and is not related to the F center concentation. The H- ion is most likely responsible for the low temperature phosphorescence also. The F center interacts with the low temperature electron trap at 10 K showing the excited state is very near to the conduction band. It appears photoconductivity associated with the F+ center is seen starting at 80 K.;A 90 K thermoluminescence peak in SrO produces F+ center emission which implies a bare oxygen vacancy may exist.;Findings and Conclusions. For aluminum oxide, the excited state in F centers autoionizes at 6 K showing this state is in or very close to the conduction band. The Stoke's shift obtained from a photoluminescence band shape analysis does not predict the experimental emission peak energy of 3.0 eV but predicts 4.8 eV. This implies the emission occurs from a different state than the one excited into. Analysis shows a strong electron-lattice interaction. Interconversion between the 6.1 and the 4.8 and 5.4 eV absorption bands occurs at 6 K. A thermoluminescence peak at 260 K is responsible for this. It is believed a H- ion is the responsible electron trap.
机译：研究范围。本研究的目的是研究氧化铝，MgO和SrO中的电子结构，电荷运动和俘获机理。研究了从6 K到300 K的热化学着色，​​电子辐照，中子辐照和γ辐照的单晶。使用了广泛的实验技术。;在MgO中，室温附近依赖于样品的2.3 eV磷光与晶体的直接相关。氧空位中捕获的H-离子浓度与F中心浓度无关。 H-离子也很可能也是造成低温磷光的原因。 F中心与10 K处的低温电子陷阱相互作用，表明激发态非常接近导带。似乎与F +中心相关的光电导始于80 K.; SrO中90 ​​K的热致发光峰产生F +中心发射，这表明可能存在裸氧空位。;发现和结论。对于氧化铝，F中心的激发态在6 K处自电离，表明该态处于或非常接近导带。从光致发光谱带形状分析获得的斯托克频移不能预测3.0 eV的实验发射峰能量，但可以预测4.8 eV。这意味着发射是从不同于激发到的状态发生的。分析显示出强的电子-晶格相互作用。 6.1、4.8和5.4 eV吸收带之间的相互转换发生在6K。260K是一个热致发光峰。据信氢离子是负责任的电子陷阱。

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  • 作者

    JEFFRIES, BRYCE TODD.;

  • 作者单位

    Oklahoma State University.;

  • 授予单位 Oklahoma State University.;
  • 学科 Condensed matter physics.
  • 学位 Ph.D.
  • 年度 1985
  • 页码 181 p.
  • 总页数 181
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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