Controllable Synthesis of NaLu(WO4)2:Eu3+ Microcrystal and Luminescence Properties for LEDs

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• 作者：Zijun Wang ; Jiuping Zhong ; Haoxing Jiang ; Jing Wang ; Hongbin Liang
• 刊名：Crystal Growth & Design
• 出版年：2014
• 出版时间：August 6, 2014
• 年：2014
• 卷：14
• 期：8
• 页码：3767-3773
• 全文大小：410K
• ISSN：1528-7505

文摘

The phosphors of trivalent rare-earth ion Eu³⁺-activated alkaline double tungstates NaLu(WO₄)₂ were prepared by the EDTA-assisted hydrothermal method. The crystal structure and morphology of the as-synthesized phosphors were determined by powder X-ray diffraction (XRD) and electron microscopes (SEM and TEM), respectively. The phase and morphology can be controlled by different Eu³⁺-doping concentrations. Not less than 40 at % of Eu³⁺ doping concentration pledged the NaLu(WO₄)₂:Eu³⁺ structure, and the microcrystal changed from hexahedron to tetrahedron with increasing Eu³⁺ doping concentration. It was found that the final product of NaLu_1鈥?i>xEu_x(WO₄)₂ (x 鈮?0.4) can not be obtained directly, intermediated by WO₃, Na₂W₂O₇, and REO(OH). The photoluminescence and electroluminescence properties were also investigated. Because of an intense red emission and a good excitation in the region of near-ultraviolet (n-UV), the samples NaLu(WO₄)₂:Eu³⁺ can be served as alternative red phosphors in the n-UV chip-based LED application.