Effects of Disorder on the Spectral Properties of Cr-Doped Glasses, Glassceramics and Crystals
The illustrations of the role played by the disordered structures on the optical properties of luminescent materials are numerous. Among the different activator ions, it is especially interesting to consider the Cr3+ ion. This ion is not only a structural probe but also a nucleating agent which generates nanocrystallites and microcrystallites inside the vitreous phase so that it gives us the possibility to follow the evolution of the structure from the glassy phase to the crystalline phase via the glass-ceramic phase. In all materials, the disordered occupation of Cr3+ sites is a general tendency. Systematically regular, perturbed and pair ions are detected by the presence of the 2E→4A2 zero-phonon lines associated with vibronic bands. In addition, energy transfers take place between each kind of site and rigorous interpretations are difficult. Anyway the relations between the structural properties and the optical properties of Cr3+-doped compounds have to be studied not only for basic research reasons but also for applications in lasers and luminescent solar collectors. In this course we will see a few examples of Cr3+-doped different host networks like oxide glasses, spinel-type glassceramics and tunable solid-state lasers by using mainly the recent Laser-Spectroscopy techniques.
KeywordsCrystal Field Octahedral Site Glassy Phase Energy Transfer Mechanism Gadolinium Gallium Garnet
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- 1.S. Sugano, Y. Tanabe, H. Kamimura, Multiplets of Transition Metal Ions in Crystals, Academic Press--New York (1970).Google Scholar
- 2.R. Reisfeld, Glass Lasers and Solar Applications in Spectroscopy of Solid State Laser Type Materials, ed. B. DiBartolo--Plenum Press, New York-London, ASI Series (1987).Google Scholar
- 4.F. Durville, B. Champagnon, E. Duval, G. Boulon, F. Gaume, A. F. Wright and A. N. Fitch, Physics and Chemistry of Glasses, 25 126 (1984).Google Scholar
- 9.G. Boulon, C. Garapon and A. Monteil, Advances in Laser Science II. Proceedings of the 1986 International Laser Science Conference: Seattle 21–24 October 1986-American Institute of Physics (1987).Google Scholar
- 10.A. Monteil, C. Garapon, and G. Boulon, Internal Report - Université Lyon I.Google Scholar
- 14.V. Viana, A. M. Lejus, D. Vivien, V. Poncon and G. Boulon, J. Solid State Chem. (to be published, 1987 ).Google Scholar
- 17.R. E. Newham, R. Santoro, J. Pearson and C. Jansen, Am. Mineral, 449, 427 (1964).Google Scholar