Polarization of emission spectra from Ti3+-doped oxide crystals - II. Zero-phonon emission lines

M. Yamaga, B. Henderson, K. P. O'Donnell, F. Rasheed, Y. Gao, B. Cockayne

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12 Citations (Scopus)


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.

Original languageEnglish
Pages (from-to)225-229
Number of pages5
JournalApplied Physics B Photophysics and Laser Chemistry
Issue number3
Publication statusPublished - 1 Mar 1991


  • crystal distortions
  • emission spectra


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