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Synthesis and tuning of the optical properties by piezoelectric effect in (Na K)(Nb Er)O3 based piezophotonic ceramics


In this project it is proposed the implantation in our country of a line of research focused on the synthesis, characterization of physical properties and phenomenological analysis of lead-free piezophotonic ceramics. With this purpose, our efforts will be focused on the synthesis of (Na K) (Nb Er)O3 ceramics (KNN-Er) that present both the coexistence of piezoelectric and photoluminescent properties and a coupling between both properties, that means, the piezophotonic effect. Through the piezophotonic effect we intend to tune the optical properties, and in particular, the energies and the intensities of the absorption and emission spectra in the visible range, of KNN-Er ceramics by the electric field-induced mechanical strain (converse piezoelectric effect). In addition, we will induce a strong anisotropy in the crystalline field of the ceramic body by the reorientation of complex defects present in the KNN-Er ceramics and to determine the effect of this anisotropy on the absorption and emission spectra. The piezophotonic properties and the phenomenological models proposed in this project will be compared with those proposed for piezoelectric photoluminescent semiconductor materials. Thus, we intend to control the synthesis of piezophotonic ceramics based on KNN-Er, as well as the theoretical and experimental knowledge of the mechanisms and protocols necessary to drive the photoluminescent properties through converse piezoelectric effect and the reorientation of complex defects. (AU)

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(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)
DOS SANTOS, M. C.; EIRAS, J. A.; LENTE, M. H.. Synthesis and characterization of optical properties of soft and hard Er3+-doped (K Na)NbO3 piezophotonic ceramics. Ferroelectrics, v. 557, n. 1, SI, p. 73-84, . (18/16609-8, 17/17543-8)

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