Nanostructured Lanthanide-Doped Lu2O3 Obtained by Propellant Synthesis

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• 作者：Stefano Polizzi ; Stefania Bucella ; Adolfo Speghini ; Fiorenzo Vetrone ; Rafik Naccache ; John C. Boyer ; and John A. Capobianco
• 刊名：Chemistry of Materials
• 出版年：2004
• 出版时间：April 6, 2004
• 年：2004
• 卷：16
• 期：7
• 页码：1330 - 1335
• 全文大小：165K
• 年卷期：v.16,no.7(April 6, 2004)
• ISSN：1520-5002

文摘

Lu_1.98Ln_0.02O₃ (Ln = Nd, Eu, and Er) powders obtained by propellant synthesis werecharacterized using XRD, SAXS, TEM, and SEM. Samples have a very porous, openmorphology with fractal scaling properties. The building blocks of the fractal aggregatesare 60-90 nm lanthanide-doped cubic Lu₂O₃ crystalline particles, which exhibit changes inthe lattice parameter proportional to the lanthanide ionic radius. The NIR luminescencespectrum of nanocrystalline Lu₂O₃:Nd³⁺ was measured and emission was observed from the⁴F_3/2 excited state to the ⁴I_J (9/2, 11/2, 13/2, 15/2) state. The spectral features are very similarto those of a bulk material of identical composition prepared for comparison, though with anoticeable difference in the relative intensity of the ⁴F_3/2 ⁴I_9/2 and ⁴F_3/2 ⁴I_11/2 transitions.The spectroscopic-quality parameter (X) for nanocrystalline samples was calculated and wasfound to be higher than for the bulk.