Eur. Phys. J. Appl. Phys.
Volume 29, Number 3, March 2005
|Page(s)||239 - 245|
|Section||Imaging, Microscopy and Spectroscopy|
|Published online||21 December 2004|
Effects of the spin-triplet states mixture and electron-phonon coupling in Y3Al5O12:Cr4+
Fukui Institute for Fundamental Chemistry, Kyoto University, 34-4
Takano Nishihiraki-cho, Sakyo-ku, Kyoto 606-8103, Japan
2 Department of Physics, West University of Timisoara, Bd. V. Parvan No. 4, 300223, Timisoara, Romania
3 Department of Materials Science and Engineering, Kyoto University, Sakyo, Kyoto 606-8501, Japan
Corresponding author: email@example.com
Revised: 4 August 2004
Accepted: 18 October 2004
Published online: 21 December 2004
The exchange charge model of the crystal field is applied to calculate the complete energy level scheme of the Cr4+ ions in Y3Al5O12 using symmetry at the Cr4+ position. Mixture of the spin-triplet states arising from the and 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.
PACS: 42.70.Hj – Laser materials / 71.70.Ch – Crystal and ligand fields
© EDP Sciences, 2005
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