Energy transfer and luminescence properties of Dy³⁺ ions doped in La₂W₃O₁₂ lattices

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• 作者：Cheol Woo Park ; Peiqing Cai ; Cuili Chen ; Qin Lin…
• 关键词：Luminescence ; Phosphor ; Rare ; earth ion ; Dy3+ ion ; Energy transfer ; Decay
• 刊名：Journal of the Korean Physical Society
• 出版年：2016
• 出版时间：November 2016
• 年：2016
• 卷：69
• 期：10
• 页码：1575-1580
• 全文大小：
• 刊物主题：Physics, general; Theoretical, Mathematical and Computational Physics; Particle and Nuclear Physics;
• 出版者：The Korean Physical Society
• ISSN：1976-8524
• 卷排序：69

文摘

La₂W₃O₁₂:Dy3+ phosphors were synthesized by using a high-temperature solid-state reaction. The Dy3+ concentration in the La₂W₃O₁₂ lattice was varied from 0.01 to 100 %. The crystalline phases of the samples were confirmed by using an X-ray diffraction analyses. Emission and excitation spectra and decay curves of Dy3+ ions in the La₂W₃O₁₂ lattices were measured at room temperature. The two charge-transfer (CT) bands that overlapped in the wavelength region 210 - 320 nm were identified as being due to the CT transitions of O2−-Dy3+ and WO₄2−. The decay times of the 4F_9/2 emission were shortened with increasing Dy3+ concentration, and the decay curves were slightly nonexponential even at low Dy3+ concentration. The decay curves were well fitted by the Inokuti-Harayama model based on the energy-transfer process between two Dy3+ ions at concentrations lower than 10 mol%. On the other hand, the energy diffusion among Dy3+ ions dominate the energy-transfer process at higher Dy3+ concentrations up to 100 mol%.