Abstract
The present paper deals with the study of electrical, optical and luminescent properties of the reduced SrTiO3 single crystals. It is shown that the annealing in vacuum at T=1100°C results in defects responsible for the increase in electroconductivity, the change in optical absorption coefficient, and in impurity photoluminescence (PL) quenching caused by Cr3+ ions.Temperature conditions of annealing in reducing atmosphere and oxidation medium allowing to vary the concentration of defects have been determined experimentally. Transmission spectra at λ=200 to 1100 nm, the dark- and photoconductivity (PC) at T=77 to 300 K, the excitation spectra of PL and PC, as well as the kinetics of PL and PC have been measured in crystals with different degrees of reduction.On the basis of the obtained results, the model of defects responsible for the change in properties of the crystals studied is also discussed in the present paper.
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