Effect of surface treatments on self-trapped exciton luminescence in single-crystal CaF{sub 2}
- Department of Physics and Materials Science Program, Washington State University, Pullman, Washington 99164-2814 (United States)
We show that near-surface defects produced by mechanical treatments and electron irradiation can significantly enhance the intensity of luminescence due to the decay of self-trapped excitons (STEs) in single-crystal calcium fluoride during 157- and 193-nm irradiation. For example, polishing can double the intensity of the STE luminescence. Defects produced by mechanical indentation can either increase or decrease the luminescence intensity, depending on the indentation force. Electron irradiation also enhances subsequent STE luminescence. When electron-irradiated samples are annealed, additional increases in luminescence intensity are observed. Plausible mechanisms for the observed effects on STE luminescence intensity are discussed.
- OSTI ID:
- 20709650
- Journal Information:
- Journal of Applied Physics, Vol. 97, Issue 10; Other Information: DOI: 10.1063/1.1904725; (c) 2005 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 0021-8979
- Country of Publication:
- United States
- Language:
- English
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