CaTiO₃:Eu³⁺ obtained by microwave assisted hydrothermal method: A photoluminescent approach

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• 作者：Tatiana M. Mazzo ; Mario L. Moreira ; Ivo M. Pinatti ; Francini C. Picon ; Edson R. Leite ; Ieda L.V. Rosa ; José ; A. Varela ; Leinig A. Perazolli ; Elson Longo
• 关键词：Calcium titanate ; Europium ; Hydrothermal microwave ; Photoluminescence
• 刊名：Optical Materials
• 出版年：2010
• 出版时间：July 2010
• 年：2010
• 卷：32
• 期：9
• 页码：990-997
• 全文大小：1147 K

文摘

Europium doped calcium titanate (CT:Eu³⁺) powders containing 0.5 % , 1.0 % and 2.0 % mol of Eu³⁺ were synthesized by hydrothermal microwave method (HTMW) at 140 °C for 10 min resulting in the samples CT:Eu³⁺ (0.5 % ) CT:Eu³⁺ (1.0 % ) and CT:Eu³⁺ (2.0 % ). Eu³⁺ ion was introduced into the perovskite lattice aiming to study the synthesis, photoluminescence emissions and morphological properties of these powders. X-ray diffraction patterns present a single phase indexed as Pbnm space group in a typical orthorhombic CaTiO₃ (CT) structure. FT-Raman spectra of CT indicated a great arrangement in a short range, while UV–vis measurements did not show any substantial changes in the optical absorbance behavior of CT:Eu³⁺ samples. The existence of two small absorbance bands at 394 and 466 nm suggests the presence of Eu³⁺ in the CT lattice, confirmed by excitation and photoluminescence emission spectra. The emission line shape transitions from ⁵D₀ to ⁷F_J (J = 0, 1–4) levels of the Eu³⁺ was noticed at, respectively 579, 589, 613, 654 and 695 nm, and the most intense one at 613 nm is ascribed to the hypersensitive ⁵D₀ → ⁷F₂ transition. Among the samples, the most intense photoluminescence results were observed for the CT:Eu³⁺ (1.0 % ).