Inhomogeneous Broadening: Symmetry of Centers and Disorder in Solid Solutions and Nanocrystals
- S.P. Feofilov
- A.A. Kaplyanskii
- A.B. Kulinkin
- R.I. Zakharchenya
- K. Ovanesyan
- A. Petrosyan
- C. Dujardin
DOIAbstract
Zero-phonon electronic transitions of Cr3+ impurity ions in solid solutions and nanocrystals are studied. In the series of Lu3xY3-3xAl5O12 (0<x<1) garnet solid solution crystals the modification of zero-phonon R-line (2E–4A2) fluorescence spectra of Cr3+ ions with changing x occurs in a discrete fashion and is not accompanied by strong inhomogeneous broadening. The effect is ascribed to high C3i symmetry of Cr3+(Al3+) sites. The fluorescence line narrowing experiments were performed for the inhomogeneously-broadened R-line of cubic Cr3+ centers in MgO nanocrystals. The inhomogeneous broadening in nanocrystals is attributed to spatial confinement
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