RESUME 

 

          The project "New optically active materials from aluminosilicate glasses" (NeoMAG) aims at the investigation of the effect of ions of large ionic radii as e.g. K+, Ba2+, Sr2+ on the spectroscopic properties of doped rare earth ions in aluminosilicate (AS) glasses. In an earlier project it could be shown that the incorporation of these ions into rare earth doped AS glasses resulted in ex­cep­tional luminescence properties, e.g. extraordinarily long fluorescence lifetimes. Up to now this effect has only been observed for the rare earth ions Sm3+ and Eu3+; experiments with other optically active ions have not been conducted so far. Furthermore, the reason of these drastic changes is yet unknown. It is assumed that the molecular structure of the rare earth sites is changed by the incorporation of K+, Ba2+and Sr2+ into the glass matrix. Different experimental and computational methods at Jena and Sfax universities will be applied to investigate this very interesting effect in detail. The results of these investigations could be used to taylor the optical properties of rare earth doped aluminosilicate glasses which could be used as optical amplifi­cation or even laser material. Furthermore, the project should strengthen the already existing cooperation between Jena and Sfax universities and meet the prerequisites to establish a new computational method at faculty of sciences, Sfax which should improve its international reputation and open the way for new international cooperations.

 

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