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Updated: May 24, 2026
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High Resolution Phonon-assisted Quasi-resonance Fluorescence Spectroscopy
Published on: June 28, 2016
The temperature dependence of Cr3+:YAG zero-phonon lines
Marco Marceddu1, Marianna Manca, Pier Carlo Ricci
1Centro d'Ateneo Grandi Strumenti, University of Cagliari, sp no. 8 Km 0.700 Monserrato-Cagliari, I09042, Italy. marco.marceddu@dsf.unica.it
Summary
Chromium (Cr(3+)) ions in yttrium aluminium garnet (YAG) exhibit strong coupling with lattice vibrations, influencing their photoluminescence. This study quantifies this electron-phonon coupling, providing insights into the material
Area of Science:
- Solid State Physics
- Materials Science
- Luminescence Spectroscopy
Background:
- Photoluminescence (PL) is crucial for understanding material properties.
- Electron-phonon coupling significantly affects optical transitions in solids.
- Yttrium aluminium garnet (YAG) is a widely used host matrix for transition metal ions.
Purpose of the Study:
- To investigate the temperature dependence of Cr(3+) ion photoluminescence in a YAG matrix.
- To analyze the electron-phonon coupling strength and its impact on zero-phonon lines.
- To compare the behavior of Cr(3+) with Fe(3+) in YAG.
Main Methods:
- Experimental measurement of photoluminescence spectra at varying temperatures.
- Analysis of experimental data using the framework of electron-phonon coupling in the quadratic approximation.
- Deconvolution of homogeneous and inhomogeneous contributions to photoluminescence linewidth.
Main Results:
- Strong electron-phonon coupling was observed for Cr(3+) in YAG.
- A Debye temperature of approximately 550 K and a quadratic coupling constant of 0.65 were determined.
- Comparison with Fe(3+):YAG revealed distinct dependencies on crystal field effects.
Conclusions:
- Cr(3+) ions in YAG are strongly coupled to lattice vibrations.
- The electron-phonon coupling significantly influences the photoluminescence linewidth.
- Understanding these interactions is key for optimizing YAG-based optical materials.
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