【作者】 朱澄静； 徐娟； 刘爽； 王丽丽； 潘再法；

【机构】 浙江工业大学化学工程与材料学院；

【摘要】 采用水热法制备了Eu³⁺掺杂SrMgB₆O₁₁纳米发光粉。利用X射线粉末衍射（XRD）,场发射扫描电子显微镜（FESEM）和荧光光谱对SrMgB₆O₁₁:Eu³⁺样品的晶体结构、形貌和发光强度进行了表征。结果表明:以SrCO₃（97%）,MgO（99.5%）,H₃BO₃（99.5%）和Eu₂O₃（99.99%）为初始原料,30ml聚四氟乙烯衬底的高压反应釜为反应容器,采用水热法可以成功地合成粒度均匀、结晶完好的SrMgB₆O₁₁:Eu³⁺纳米发光粉。论文还深入研究了不同反应温度（120℃,140℃,160℃,180℃和200℃）和不同pH值（7,8,9和10）对SrMgB₆O₁₁:Eu³⁺纳米材料的晶体结构及形貌的影响。XRD图可以发现,在120℃时形成了尖锐并且强度最强的衍射峰,同时FESEM也表明此时所得材料为纳米棒组成的规则扇形形貌,此后随着温度的升高,XRD图中衍射峰的位置和强度发生变化,说明荧光粉的晶体结构发生变化,FESEM也表明该荧光粉已变为球形颗粒。论文还研究了随着反应温度的升高,荧光强度先增强后减弱。随着pH的增大,光谱图中峰的劈裂数发生了变化,说明样品发光强度与颗粒的晶体结构及形貌有密切关系。论文还初步探讨了纳米粒子的生长机制。更多还原

【Abstract】 Eu³⁺ doped SrMgB₆O₁₁ nano-phosphors were prepared by a hydrothermal method.The crystal structure,morphology and luminescence properties of SrMgB₆O₁₁:Eu³⁺ nano-phosphors were characterized by X-ray powder diffraction（XRD）,field emission scanning electron microscopy（FESEM） and fluorescence spectra,respectively.The results show that with the SrCO₃（97%）,MgO（99.5%）,H₃BO₃（99.5%） and Eu₂O₃ （99.99%） as starting materials,nano-crystal SrMgB₆O₁₁:Eu³⁺ phosphors were successfully synthesized in 30ml Teflon-lined stainless steel autoclaves by hydrothermal method.The effects of different reaction temperature（120℃,140℃,160°C,180℃and 200°C） and different pH values（7,8,9 and 10） on the crystal structure and morphology of SrMgB₆O₁₁:Eu³⁺ nano-phosphors were also studied in this paper.The results of XRD indicated that diffraction peaks are sharp and strong when temperature is 120℃,meanwhile the’ FESEM shows the morphology is the fan-shaped by made of nanorods.With the temperature increasing,the diffraction angle and intensity of diffraction peaks were changed in the XRD diagram,and the FESEM shows the morphology has become spherical particles.The emission intensity increased firstly and then decreased,when the temperature changed from 120℃to 200℃.The splitting of the emission peaks changes depended on pH values,which indicating that luminescence properties is closely related to the crystal structure and morphology of particles.The growth mechanism of nano-particles was also discussed in this paper.更多还原