https://doi.org/10.1007/s100510050973
Luminescence property studies of α-Al2O3 by means of nanosecond time-resolved VUV spectroscopy
1
Yerevan Physics Institute, Alikhanian Br. 2, 375036, Yerevan, Armenia
2
Lebedev Physics Institute, Leninski prosp. 53, 117924, Moscow, Russia
Corresponding author: a arsen@moon.yerphi.am
Received:
20
October
1998
Revised:
20
January
1999
Published online: 15 November 1999
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 
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 (
-centers).
PACS: 61.72. y – Defects and impurities in crystals; microstructure / 61.72.Ji – Point defects (vacancies, interstitials, color centers, etc.) and defect clusters / 61.80. x – Physical radiation effects, radiation damage
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag, 1999
