Triple-Layered Perovskite Niobates CaRNb3O10 (R = La, Sm, Eu, Gd, Dy, Er, Yb, or Y): New Self-Activated Oxides

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• 作者：Lin Qin ; Donglei Wei ; Yanlin Huang ; Sun Il Kim ; Young Moon Yu ; Hyo Jin Seo
• 刊名：Inorganic Chemistry
• 出版年：2013
• 出版时间：September 16, 2013
• 年：2013
• 卷：52
• 期：18
• 页码：10407-10413
• 全文大小：565K
• 年卷期：v.52,no.18(September 16, 2013)
• ISSN：1520-510X

文摘

Niobates CaRNb₃O₁₀ (R = La, Sm, Eu, Gd, Dy, Er, Yb, or Y) were prepared by conventional high-temperature solid-state reaction. The formation of a single-phase compound with triple-layered perovskite-type structure was verified through X-ray diffraction (XRD) studies. The luminescence characteristics such as photoluminescence excitation and emission spectra, X-ray-excited luminescence (XEL), Stokes shift, decay curves, and color coordinates were investigated. The niobates can be efficiently excited by UV light and present luminescence behaviors with rich luminescence colors. Under excitation by ultraviolet radiation, CaRNb₃O₁₀ (R = La, Gd, Yb, or Y) exhibits strong blue luminescence due to the self-activation center of the octahedral NbO₆ groups, even at room temperature. For the materials of composition CaRNb₃O₁₀ (R = Sm, Eu, Dy, or Er), the excitation at the host band produces a characteristic luminescence of rare earth ions, indicating a host鈥揼uest energy transfer process. CaRNb₃O₁₀ (R = Eu) has the strongest luminescence intensity, which can be efficiently excitated by near UV wavelength. It could be suggested to be a potential candidate for the application on near-UV excited white LEDs.