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  • 1
    Electronic Resource
    Electronic Resource
    Polarization of emission spectra from Ti3+-Doped oxide crystals (1991)
    Springer
    Applied physics 52 (1991), S. 122-131 
    Details
    ISSN: 1432-0649
    Keywords: 42.55R ; 42.70 ; 79.60
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The photoluminescence spectra of Ti3+-doped YAlO3, Y3Al5O12 and Al2O3 crystals display weak zero-phonon lines and broad vibronic side bands. The zero-phonon lines are due to the splitting of the 2 T 2g ground state into three Kramers' doublets by the combined effects of static axial crystal field, Jahn-Teller effect and spin-orbit interaction. A molecular orbital method is used to calculate the relative intensities and polarizations of both zero-phonon lines and broad band in terms of the mixing of odd-parity ligand wavefunctions into even-parity Ti3+ wavefunctions by odd-parity crystal fields of T 1u and T 2u symmetries at sites with tetragonal and trigonal symmetries. The odd-parity distortions may be static or dynamic and are of crucial relevance in determining the strength of vibronically induced transitions. In general, selection rules for optical spectra are uniquely determined by group theory. The relevance of the molecular orbit description of the d-d transitions is that it permits a physical interpretation of the strength of optical spectra in terms of the covalent charge transfer from ligand ions to central ions induced by odd-parity crystal field distortion.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00357666
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Polarization of emission spectra from Ti3+-doped oxide crystals (1991)
    Springer
    Applied physics 52 (1991), S. 225-229 
    Details
    ISSN: 1432-0649
    Keywords: 42.55R ; 42.70 ; 79.60
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: 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.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00750955
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    Paper (German National Licenses)
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