Abstract:
The luminescence spectra of corundum monocrystals grown by different methods are investigated by means of a time-resolved spectroscopy method at temperatures 90 K and 300 K. The existence of fast and slow emission in the VUV luminescence spectra of irradiated and nonirradiated crystals was observed. We observed luminescence bands with a maximum at 326 nm produced by F + centers. A new type of fast luminescence at the band of 270 nm was found. This is known as cross-luminescence and is connected with the recombination of valence band electrons with the holes in the low ground band. It was shown that the band of 410 nm isn't due to to anionic centers (F-centers), but is determined by the short lifetime center of emission (F --centers).
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Received 20 October 1998 and Received in final form 20 January 1999
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Harutunyan, V., Gevorkyan, V. & Makhov, V. Luminescence property studies of α-Al2O3 by means of nanosecond time-resolved VUV spectroscopy. Eur. Phys. J. B 12, 35–38 (1999). https://doi.org/10.1007/s100510050973
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DOI: https://doi.org/10.1007/s100510050973