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Effects of the spin-triplet states mixture and electron-phonon coupling in Y3Al5O12:Cr4+

Published online by Cambridge University Press:  21 December 2004

M. G. Brik ,
N. M. Avram ,
C. N. Avram  and
I. Tanaka
M. G. Brik*
Affiliation:
Fukui Institute for Fundamental Chemistry, Kyoto University, 34-4 Takano Nishihiraki-cho, Sakyo-ku, Kyoto 606-8103, Japan
N. M. Avram
Affiliation:
Department of Physics, West University of Timisoara, Bd. V. Parvan No. 4, 300223, Timisoara, Romania
C. N. Avram
Affiliation:
Department of Physics, West University of Timisoara, Bd. V. Parvan No. 4, 300223, Timisoara, Romania
I. Tanaka
Affiliation:
Department of Materials Science and Engineering, Kyoto University, Sakyo, Kyoto 606-8501, Japan
*
brik@fukui.kyoto-u.ac.jp
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Abstract

The exchange charge model of the crystal field is applied to calculate the complete energy level scheme of the Cr4+ ions in Y3Al5O12 using $D_{2d}$  symmetry at the Cr4+ position. Mixture of the spin-triplet states arising from the  $^{3}F$ and $^{3}P$ terms of the 3d 2-electron configuration is shown to have a profound effect on the energy levels sequence. Large splittings of the orbital triplets originating from the “parent” Td symmetry are explained by large contribution of the low-symmetry component of the crystal field. Huang-Rhys parameter and effective phonon energy are evaluated from the experimental spectroscopic data available in the literature. Temperature-dependent probability of the nonradiative transition between the ground and first excited states is drawn; the emission band shape is obtained using the single configuration coordinate model.

Keywords

Type
Research Article
Information
The European Physical Journal - Applied Physics , Volume 29 , Issue 3 , March 2005 , pp. 239 - 245
Copyright
© EDP Sciences, 2005

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