Optical properties of lead-free piezophotonic ceramics

Reference	Presenter	Authors (Institution)	Abstract
08-154	Manuel Henrique Lente	Lente, M.H.(Universidade Federal de São Paulo); Eiras, J.A.(Universidade Federal de São Carlos); Santos, M.C.(Universidade Federal de São Paulo);	Materials that have two or more coupled physical properties of technological interest is very interesting due to the interdisciplinary field of research and for potential practical applications. In this context, some works have recently proposed the possibility of coupling between piezoelectric and optical properties. Indeed, it was inferred the possibility of tuning the photoluminescent properties in earth-rare doped ferroelectric ceramics by employing the piezoelectric effect. Materials that present such property have been called piezophotonic ones. A promising class of piezophotonic ceramics is that based on Potassium Sodium Niobate (KNN) ferroelectric ceramics. KNN ceramics present interesting piezoelectric properties and are suitable host matrix for earth-rare ions. In this work, (KNaLiLa)(NbBiEr)O3 (KNN-Er) piezophotonic ceramics were prepared by the conventional mixed oxide route and their structural and the optical properties in the UV-VIS-NIR range were determined. The absorbance spectrum of KNN-Er piezophotonic ceramics were characterized and compared to the Er2O3. The results were explained by considering the influence of local crystallographic symmetry of the ferroelectric host lattice on the electronic structure and, consequently, on the optical properties.
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