Meneses-Franco Ariel, Campos-Vallette Marcelo, Vásquez Sergio Octavio, Soto-Bustamante Eduardo A
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.
Materials (Basel). 2018 Oct 12;11(10):1950. doi: 10.3390/ma11101950.
Photoluminescent mechanisms in erbium-doped barium titanate nanoparticle systems were studied. Er ions were introduced into the BaTiO₃ lattice by the sol-gel method. The resulting Er 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 ²H/⁴S→⁴I at 523 and 548 nm respectively and other photoluminescent mechanisms as ⁴I→⁴I around 4000 nm (2500 cm) 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.
研究了掺铒钛酸钡纳米颗粒体系中的光致发光机制。通过溶胶 - 凝胶法将铒离子引入BaTiO₃晶格中。所得铒浓度在0%至5%之间，Ba/Ti比为1.008和0.993。晶格中Ba和Ti浓度的化学计量影响了铒离子在晶格结构中的掺杂机制和位置。我们的研究表明，Ba/Ti比、铒浓度、相结构和掺杂位点位置在上转换光致发光机制之间存在很强的相关性。使用拉曼光谱和发射光谱研究了分别在523和548 nm处的竞争性上转换发射²H/⁴S→⁴I以及在4000 nm（2500 cm）附近的⁴I→⁴I等其他光致发光机制。当材料在周围激活剂中呈现高畸变时，上转换过程比其他光致发光衰减更为显著。
