Luminescence of impurity 3d and 4f metal ions in different crystalline forms of Al2O3
Authors:
- 1 May 2000
- journal article
- Published by Pleiades Publishing Ltd in Physics of the Solid State
- Vol. 42 (5) , 857-860
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.Keywords
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