Abstract
The 2 E-4 A 2 luminescence spectra of Cr3+ ions in Al2O3 are investigated in the course of transitions between the structural forms γ-δ-θ-α. The spectral lines observed are assigned to Cr3+ ions in these structural forms, which are identified by an X-ray powder diffraction analysis. The lifetimes of the Cr3+ excited states in transient forms of Al2O3 are measured. Investigations of the luminescence spectra of Al2O3: Eu3+ demonstrate that the Eu3+ ions can form regular centers only in α-Al2O3 and, unlike the Cr3+ ions, give no rise to similar centers in moderately ordered θ-Al2O3.
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Translated from Fizika Tverdogo Tela, Vol. 42, No. 5, 2000, pp. 835–838.
Original Russian Text Copyright © 2000 by Kulinkin, Feofilov, Zakharchenya.
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Kulinkin, A.B., Feofilov, S.P. & Zakharchenya, R.I. Luminescence of impurity 3d and 4f metal ions in different crystalline forms of Al2O3 . Phys. Solid State 42, 857–860 (2000). https://doi.org/10.1134/1.1131301
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DOI: https://doi.org/10.1134/1.1131301