Abstract
Structural and optical studies on erbium-doped nanomaterials are of broad interest due to their large potential in advanced photonic applications [1–8]. Their wet chemical processing (sol-gel, solution combustion synthesis, colloidal routes etc.) has been largely explored using different erbium hosts such as titania [1], zirconia [2], II-VI-semiconductors [3,4], aluminosilicates [5], silica [6,7] as well as yttria [8]. Of particular interest to us are the ErIII- doped planar wave guides prepared from so-called ”polymeric sols” containing weakly branched molecular clusters. Previous optogeometrical studies [1, 2] on these sol-gel nanostructures have indicated that thermal annealing of wet gel layers seems to be the most crucial processing step. Critically:
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1.
elimination of high energy vibrations (liberating organics and OH-groups),
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2.
blocking of Er-clustering as the result of phase separation/transformation processes
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3.
suppression of nanocrystal formation/growth which give rise to increased scattering are needed in order to achieve the optimal active waveguide performance (reduced damping losses and a long life time of the photoexcited ErIII ions).
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Kohls, M. et al. (2003). Nanocrystalline ErIII/SiIV@ZnO Multilayers: A Detailed Optical and Structural Study. In: Liz-Marzán, L.M., Giersig, M. (eds) Low-Dimensional Systems: Theory, Preparation, and Some Applications. NATO Science Series, vol 91. Springer, Dordrecht. https://doi.org/10.1007/978-94-010-0143-4_9
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DOI: https://doi.org/10.1007/978-94-010-0143-4_9
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