Solvothermal method to obtain europium-doped yttrium oxide

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• 作者：Davolos ; Marian Rosaly ; Feliciano ; Sergio ; Pires ; Ana M. ; Marques ; Rodrigo F.C. ; Jafelicci Jr ; Miguel
• 关键词：Y₂O₃ ; Eu ; Solvothermal ; Isopropanol ; Luminescence
• 刊名：Journal of Solid State Chemistry
• 出版年：2003
• 出版时间：February, 15 - March, 1 2003
• 年：2003
• 卷：171
• 期：1-2
• 页码：268-272
• 全文大小：1.57 M

文摘

Pure yttrium oxide or mixed with europium oxide (3at % ) were treated in supercritical isopropanolic suspension at 500°C for 20h and filling degree of 50 % . Products were supercritically dried and characterized by scanning electron microscopy (SEM), X-ray powder diffraction (XRD), infrared spectroscopy (IR) and luminescence spectroscopy (LS). Particle shape is irregular with an equivalent diameter of ca. 5μm. Cubic crystalline phase is mainly obtained and hydroxide ion in low concentration is detected by IR vibrational spectrum. Europium in this concentration does not extensively change such observed characteristics from the pure yttrium oxide. Luminescence spectra show that the doped product is a mixture of the two oxides added by oxyhydroxide impurities. Nevertheless, this precursor sample, after being heated at 900°C during 1h, has all characteristics, especially luminescent ones, of the P22 commercial phosphor.