This article is cited in 32 papers

Dielectrics

Thermal- and photo-induced transformations of luminescence centers in $\alpha$-Al$_2$O$_3$ anion-defective crystals

S. V. Solov’ev^a, I. I. Mil'man^a, A. I. Surdo<sup>b

a</sup> Ural Federal University named after the First President of Russia B. N. Yeltsin, Ekaterinburg
^b Institute of Industrial Ecology Ural Branch of RAS, Ekaterinburg

Abstract: The thermal- and photo-induced transformations of luminescence centers in anion-defective crystals of $\alpha$-Al$_2$O$_3$ have been investigated. It has been found that the exposure of crystals to ultraviolet light at temperatures in the range 50–900$^\circ$C leads to substantial changes in their thermoluminescence and radioluminescence spectra. According to the optical absorption and photoluminescence data, the detected $F$-type centers have been identified and the temperature ranges of the $F\to F^+\to F_2$ transformations and their possible mechanisms have been determined. The special attention has been drawn to the detailed similarity in the formation of complex $F_2$-type centers in the initially perfect $\alpha$-Al$_2$O$_3$ crystals irradiated with fast neutrons and in the studied anion-defective crystals.

Received: 11.05.2011
Accepted: 01.09.2011

 English version: Physics of the Solid State, 2012, 54:4, 726–734

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