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Title: Oscillator strengths, Huang-Rhys parameters, and vibrational quantum energies of cerium-doped gadolinium oxyorthosilicate

Abstract

Temperature-dependent optical absorption of cerium-doped gadolinium oxyorthosilicate (Gd{sub 2}SiO{sub 5}:Ce) has been measured and analyzed for impurity-ion-lattice coupling parameters and oscillator strengths. Although the spectrum consists of overlapping Ce{sup 3+} bands and Gd{sup 3+} lines, two well-resolved Ce{sup 3+} bands with 10 K maxima at 3.32 eV (peak a) and 3.61 eV (peak b) are amenable to spectral analysis. These bands, previously assigned to Ce{sup 3+} ions occupying crystallographically inequivalent substitutional sites, are characterized by Gaussian line shapes and temperature-dependent half widths that are well described by the linear model of impurity-ion-lattice coupling. Huang-Rhys [Proc. R. Soc. A 204, 404 (1950)] parameters of peaks a and b are 22.7 and 5.7, respectively, indicating strong ion-lattice coupling, with vibrational frequencies 1.83x10{sup 13} s{sup -1} (peak a) and 5.07x10{sup 13} s{sup -1} (peak b). Peak b centroid is approximately temperature independent, but peak a centroid shifts to higher energy with increasing temperature. This dependence is adequately described by including higher-order coupling terms in the ion-lattice interaction, although crystal-field contributions cannot be excluded. Absorption band oscillator strengths, f, are calculated from Smakula's [Z. Phys. 59, 603 (1930)] formula and knowledge of cerium concentration for the two inequivalent sites. In the interval 10-300 K,more » peak a f values range from (9.8 to 26.8)x10{sup -4} and peak b f values vary from (7.8 to 5.8)x10{sup -3}. From the known correlation between oscillator strength and metal-ion-ligand separation, we identify peaks a and b as the seven- and nine-oxygen-coordinated sites, respectively. (c) 2000 American Institute of Physics.« less

Authors:
 [1];  [1];  [1];  [1];  [1]
  1. Materials Science and Technology Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545 (United States)
Publication Date:
OSTI Identifier:
20216372
Resource Type:
Journal Article
Journal Name:
Journal of Applied Physics
Additional Journal Information:
Journal Volume: 87; Journal Issue: 11; Other Information: PBD: 1 Jun 2000; Journal ID: ISSN 0021-8979
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; GADOLINIUM OXIDES; SILICATES; CERIUM ADDITIONS; OSCILLATOR STRENGTHS; VIBRATIONAL STATES; ABSORPTION SPECTRA; DOPED MATERIALS; IMPURITIES; TEMPERATURE DEPENDENCE; EXPERIMENTAL DATA

Citation Formats

Cooke, D. W., Bennett, B. L., McClellan, K. J., Roper, J. M., and Whittaker, M. T. Oscillator strengths, Huang-Rhys parameters, and vibrational quantum energies of cerium-doped gadolinium oxyorthosilicate. United States: N. p., 2000. Web. doi:10.1063/1.373456.
Cooke, D. W., Bennett, B. L., McClellan, K. J., Roper, J. M., & Whittaker, M. T. Oscillator strengths, Huang-Rhys parameters, and vibrational quantum energies of cerium-doped gadolinium oxyorthosilicate. United States. doi:10.1063/1.373456.
Cooke, D. W., Bennett, B. L., McClellan, K. J., Roper, J. M., and Whittaker, M. T. Thu . "Oscillator strengths, Huang-Rhys parameters, and vibrational quantum energies of cerium-doped gadolinium oxyorthosilicate". United States. doi:10.1063/1.373456.
@article{osti_20216372,
title = {Oscillator strengths, Huang-Rhys parameters, and vibrational quantum energies of cerium-doped gadolinium oxyorthosilicate},
author = {Cooke, D. W. and Bennett, B. L. and McClellan, K. J. and Roper, J. M. and Whittaker, M. T.},
abstractNote = {Temperature-dependent optical absorption of cerium-doped gadolinium oxyorthosilicate (Gd{sub 2}SiO{sub 5}:Ce) has been measured and analyzed for impurity-ion-lattice coupling parameters and oscillator strengths. Although the spectrum consists of overlapping Ce{sup 3+} bands and Gd{sup 3+} lines, two well-resolved Ce{sup 3+} bands with 10 K maxima at 3.32 eV (peak a) and 3.61 eV (peak b) are amenable to spectral analysis. These bands, previously assigned to Ce{sup 3+} ions occupying crystallographically inequivalent substitutional sites, are characterized by Gaussian line shapes and temperature-dependent half widths that are well described by the linear model of impurity-ion-lattice coupling. Huang-Rhys [Proc. R. Soc. A 204, 404 (1950)] parameters of peaks a and b are 22.7 and 5.7, respectively, indicating strong ion-lattice coupling, with vibrational frequencies 1.83x10{sup 13} s{sup -1} (peak a) and 5.07x10{sup 13} s{sup -1} (peak b). Peak b centroid is approximately temperature independent, but peak a centroid shifts to higher energy with increasing temperature. This dependence is adequately described by including higher-order coupling terms in the ion-lattice interaction, although crystal-field contributions cannot be excluded. Absorption band oscillator strengths, f, are calculated from Smakula's [Z. Phys. 59, 603 (1930)] formula and knowledge of cerium concentration for the two inequivalent sites. In the interval 10-300 K, peak a f values range from (9.8 to 26.8)x10{sup -4} and peak b f values vary from (7.8 to 5.8)x10{sup -3}. From the known correlation between oscillator strength and metal-ion-ligand separation, we identify peaks a and b as the seven- and nine-oxygen-coordinated sites, respectively. (c) 2000 American Institute of Physics.},
doi = {10.1063/1.373456},
journal = {Journal of Applied Physics},
issn = {0021-8979},
number = 11,
volume = 87,
place = {United States},
year = {2000},
month = {6}
}