Abstract
Behaviour of the intrinsic emissions of 7.6, 3.45 and 3.6 eV in Al 2O 3, Y 2O 3 and Sc 2O 3, respectively, has been studied under a crystal excitation by 5–35 eV photons at 8–80 K. In Al 2O 3 and Y 2O 3, electrons and holes do not undergo transformation into a self-trapped state, while self-shrunk excitons are formed at the direct optical creation of excitons or at the recombination of electrons with holes under the conditions of a high excitation density. In line with the theoretical assumption made by Sumi, manifestations of the photocreation of spatially correlated self-trapped d-electrons and p-holes are revealed in the spectra of the tunnel phosphorescence of Sc 2O 3.
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