Theory of the structure of the self-trapped exciton in quartz
作者： A J Fisher , W Hayes , A M Stoneham
DOI: 10.1088/0953-8984/2/32/001
关键词: Photoluminescence 、 Stokes shift 、 Molecular physics 、 Biexciton 、 Exciton 、 Condensed matter physics 、 Electron 、 Chemistry 、 Electronic structure 、 Wide-bandgap semiconductor 、 Excited state 、 General Materials Science
摘要: Quartz is an insulator with extremely wide band gap in the vacuum ultra-violet. However, under irradiation from high-energy electrons or X-rays, samples of high purity emit a luminescence blue, corresponding to Stokes shift approximately 7 eV. This large has been ascribed self-trapping exciton otherwise perfect lattice owing distortion it induces; authors review evidence for this assignment, and describe electronic-structure calculations which reveal structure distorted configuration also explain various experimentally determined properties centre. The process they postulate novel one as driven primarily by electron component exciton.
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