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Materials (Basel). 2018 Oct 12;11(10). pii: E1950. doi: 10.3390/ma11101950.

Er-Doped Nanostructured BaTiO₃ for NIR to Visible Upconversion.

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NSC Nanosono SA, R&D Corporation, Hakidma 7, Yokneam industrial Park 2069200, Israel.
Department of Chemistry, Faculty of Science, University of Chile, Las Palmeras 3425, Ñuñoa, Santiago 780003, Chile.
Department of Materials Science, Faculty of Physical and Mathematics Sciences, University of Chile, Beauchef 850, Santiago 837048, Chile.
Department of Organic Chemistry and Physical Chemistry, Faculty of Chemical and Pharmaceutical Sciences, University of Chile, Sergio Livingstone 1007, Independencia, Santiago 8380492, Chile.


Photoluminescent mechanisms in erbium-doped barium titanate nanoparticle systems were studied. Er3+ ions were introduced into the BaTiO₃ lattice by the sol-gel method. The resulting Er3+ concentration was between 0% and 5%, with Ba/Ti ratios of 1.008 and 0.993. The stoichiometry of Ba and Ti concentrations in the lattice influenced the doping mechanism and placement of erbium ions in the lattice structure. Our research shows the existence of a strong correlation between Ba/Ti ratios, erbium concentration, phase structure and doping site location on the upconversion photoluminescence mechanisms. Competing upconversion emissions ²H11/2/⁴S3/2→⁴I15/2 at 523 and 548 nm respectively and other photoluminescent mechanisms as ⁴I9/2→⁴I11/2 around 4000 nm (2500 cm-1) were studied using Raman and emission spectroscopy. The upconversion process is predominant over other photoluminescent decay when the material presents high distortion in the surrounding activator.


Barium Titanate; Erbium; nanoparticle; photoluminescent; upconversion

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