Solvothermal Synthesis and Luminescence Properties of BaCeF5, and BaCeF5: Tb3+, Sm3+ Nanocrystals: An Approach for White Light Emission

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• 作者：Tianqi Sheng ; Zuoling Fu ; Xiaojie Wang ; Shihong Zhou ; Siyuan Zhang ; Zhenwen Dai
• 刊名：The Journal of Physical Chemistry C
• 出版年：2012
• 出版时间：September 13, 2012
• 年：2012
• 卷：116
• 期：36
• 页码：19597-19603
• 全文大小：385K
• 年卷期：v.116,no.36(September 13, 2012)
• ISSN：1932-7455

文摘

Novel monodisperse BaCeF₅ and BaCeF₅: Tb³⁺, Sm³⁺ nanocrystals have been successfully synthesized by a simple one-step solvothermal synthesis. Uniformly distributed nanocrystals with an octahedral morphology and particle size of 75鈥?0 nm were observed. X-ray diffraction (XRD), field emission-scanning electron microscopy (FE-SEM), photoluminescence (PL), and decay studies were employed to characterize the samples. Under ultraviolet irradiation, the BaCeF₅: Tb³⁺, Sm³⁺ samples exhibit the typical green emission band of the Tb³⁺ ions, as well as an orange-red and red emission bands of the Sm³⁺ ions in the presence of Ce³⁺ ions. The highly intense orange-red and red emission bands of the Sm³⁺ ions were attributed to the effective energy transfer from the Tb³⁺ to Sm³⁺ ions, which has been justified through the luminescence spectra and the fluorescence decay dynamics. The luminescence colors of BaCeF₅: Tb³⁺, Sm³⁺ nanophosphors can be easily tuned by changing the concentration of Sm³⁺ ions. These results suggest that BaCeF₅: Tb³⁺, Sm³⁺ nanocrystals can be explored for three-dimensional displays, back lighting, white light sources, and so on.