Polarization of emission spectra from Ti3+-doped oxide crystals |
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Authors: | M Yamaga B Henderson K P O'Donnell F Rasheed Y Gao B Cockayne |
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Institution: | (1) Department of Physics and Applied Physics, University of Strathclyde, G4 0NG Glasgow, UK;(2) Royal Signal and Radar Establishment, WR14 3PS Malvern, Worcestershire, UK;(3) Present address: Department of Physics, Faculty of General Education, Gifu University, 501-11 Gifu, Japan |
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Abstract: | The Ti3+ ion in YAlO3 (YAP), Y3Al5O12 (YAG), and Al2O3 crystals occupies distorted octahedral sites relative to the nearest neighbour ligand ions. Such distortions are of even-parity in YAG where the zero-phonon lines in emission occur via magnetic dipole transitions. In contrast, the zero-phonon transitions occur by electric dipole processes in Ti3+:YAP and Ti3+:Al2O3 where there are odd-parity distortions from octahedral symmetry. This paper reports measurements of the zero-phonon lines of Ti3+ ions in YAP, YAG, and Al2O3 at 10 K. The zero-phonon lines of Ti3+:YAP are strongly polarized perpendicular to the tetragonal axis and those of Ti3+:Al2O3 parallel to the trigonal axis. The experimental results are shown to be in accord with a molecular orbital model of the radiative transition according to which the transition intensities derive from odd-parity ligand wavefunctions induced into even-parity ground and excited Ti3+ wavefunctions by odd-parity crystal distortions. |
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Keywords: | 42 55R 42 70 79 60 |
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