Enhanced Luminescence in Ln3+-Doped Y2WO6 (Sm, Eu, Dy) 3D Microstructures through Gd3+ Codoping

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• 作者：Anna M. Kaczmarek ; Kristof Van Hecke ; Rik Van Deun
• 刊名：Inorganic Chemistry
• 出版年：2014
• 出版时间：September 15, 2014
• 年：2014
• 卷：53
• 期：18
• 页码：9498-9508
• 全文大小：748K
• ISSN：1520-510X

文摘

Microstructures of Y₂WO₆ were prepared by applying a hydrothermal synthesis in the presence of sodium dodecyl sulfate (SDS) surfactant, after which the materials were heat-treated at a temperature of 1100 掳C. When prepared at pH 3, the spherical 3D microstructures were built from nanosized particles. Raising the pH gave materials built from differently shaped building blocks, which influenced the final architecture. These materials, similarly to other previously investigated and reported rare-earth tungstate materials, were found to show very interesting luminescence properties. However, quantum yield (QY) values have scarcely been reported for such materials. In this work, a detailed study of the photoluminescence characteristics, decay times, and quantum yields of Y₂WO₆ doped with Sm³⁺, Eu³⁺, and Dy³⁺ is presented. When doped with different concentrations of Ln³⁺ ions, the luminescence properties of the samples changed. The 2.5% Dy:Y₂WO₆ sample gave white-light emission and showed a QY of 17%. For the optimal lanthanide-ion concentrations, the systems were codoped with 2% and 10% Gd³⁺ ions to test the possible enhancement of luminescence through energy transfer from W鈥揙 and/or Gd³⁺ to Ln³⁺. The Eu³⁺,Gd³⁺-codoped system showed QYs as high as 79%. The Sm,Gd-codoped system showed the highest enhancement of QY. After incorporation of Gd³⁺ ions, the 2.5% Sm_10% Gd:Y₂WO₆ materials showed a QY approximately 2.4 times larger than that of the 2.5% Sm:Y ₂WO₆ material.