- Microscopic evidence for role of oxygen in luminescence of Er3+ ions in Si: Two-color and pump-probe spectroscopy
- Physical Review B
- Volume | Issue number
- 78 | 3
- Number of pages
- Document type
- Faculty of Science (FNWI)
- Van der Waals-Zeeman Institute (WZI)
Influence of oxygen on optical activity and thermal stability of the 1.5 µm emission of Er3+ ions in Si is well documented. Here we support this predominantly phenomenological notion with microscopic evidence. Using two-color and pump-probe spectroscopy with a free-electron laser we establish a direct link between the 1.5 µm emission from Er3+ ions and the 9 µm vibrational band of interstitial oxygen in Si. We show that: i) intensity of the 1.5 µm emission quenches when the 9 µm oxygen vibration is resonantly excited, and ii) the lifetime of the 9 µm vibrational band is affected by Er presence. Both findings evidence microscopic relation of interstitial oxygen and Er and their close proximity in Si matrix.
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