The role of sodium compound fluxes used to synthesize Gd₂O₂S:Tb³⁺ by sulfide fusion method

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• 作者：Yujie Ding ; Zhiyuan Zhang ; Lixi Wang…
• 刊名：Journal of Materials Science: Materials in Electronics
• 出版年：2017
• 出版时间：February 2017
• 年：2017
• 卷：28
• 期：3
• 页码：2723-2730
• 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

Different sodium compound fluxes were chosen to synthesize Gd₂O₂S:Tb3+ phosphor by the sulfide fusion method. X-ray diffraction, fluorescent spectrophotometer, field emission scanning electron microscope (FE-SEM), thermal gravimetric analyses and differential scanning calorimetry were used to analyze the influences of sodium compound fluxes on the phase formation, luminescence properties, morphology and reaction process of Gd₂O₂S:Tb3+. It was shown that the existence of Na₂S₂O₃ and Na₂S_x (x = 2~6) ensured the formation of Gd₂O₂S phase and improved the Tb3+ doping into substrate materials. The particle growth of phosphors was attributed to the effective flux agent of Na₂S, and larger particles could be formed by adding Na₂S. The grown particles presented a hexagonal shape, and larger particles were constructed by packing smaller ones along the c-axis direction. Furthermore, Gd₂O₂S:Tb3+ exhibited 544 nm emission peak due to the 5D₄ → ^{7F₅ transition of Tb3+ when excited at 254 nm, and the luminescence intensity of it with the addition of Na₂S₂O₃ was stronger than that prepared from other sodium compound fluxes including Na₂S_x, Na₂CO₃, Na₂SO₃ and Na₂S.}