Hydrothermal synthesis of NaLa(WO₄)₂:Eu³⁺ octahedrons and tunable luminescence by changing Eu³⁺ concentration and excitation wavelength

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• 作者：Yanxia Tang ; Yongfei Ye ; Haihui Liu&#8230
• 刊名：Journal of Materials Science: Materials in Electronics
• 出版年：2017
• 出版时间：January 2017
• 年：2017
• 卷：28
• 期：2
• 页码：1301-1306
• 全文大小：
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Optical and Electronic Materials; Characterization and Evaluation of Materials;
• 出版者：Springer US
• ISSN：1573-482X
• 卷排序：28

文摘

NaLa(WO₄)₂:Eu3+ phosphors with different Eu3+ concentrations have been synthesized by a hydrothermal method. The phase is confirmed by XRD analysis, which shows a pure-phase NaLa(WO₄)₂ XRD pattern for all of NaLa(WO₄)₂:Eu3+ phosphors. The SEM and TEM images indicate that all of NaLa(WO₄)₂:Eu3+ phosphors have a octahedral morphology. These suggest that the Eu3+ doping has no influence on the structure and growth of NaLa(WO₄)₄ particles. By monitoring the emission of Eu3+ at 615 nm, NaLa(WO₄)₂:Eu3+ phosphors show excitation bands originating from both host and Eu3+ ions. Under the excitation at 271 nm corresponding to WO₄2− groups, emission bands coming from the 1A₁ → ^{3T₁ transition with the WO₄2−} groups and the 5D₀ → ^{7F_j (j = 0, 1, 2, 3 and 4) transitions of Eu3+ are observed. The emission intensity relating to WO₄2−} groups decreases with increasing Eu3+ concentration. But emission intensities of Eu3+ increase firstly and then decreases because of concentration quenching effect. Under the excitation at 395 nm corresponding to 7F₀ → ^{5L₆ transition of Eu3+, only characteristic Eu3+ emission bands can be observed. The results of this work suggest that tunable luminescence can be obtained for Eu3+ doped NaLa(WO₄)₂ phosphors by changing Eu3+ concentration and excitation wavelength.}