(La0.95Eu0.05)F3纳米晶的自牺牲模板法合成及其下转换发光性能研究  

(La0.95Eu0.05)F3 Nanocrystal Synthesized by Sacrificial Template Method and Down-Conversion Luminescence Properties

作　　者：赵昕睿 李龙娇 龚长帅 王楚祺 马藤 王雪娇 ZHAO Xinrui;LI Longjiao;GONG Changshuai;WANG Chuqi;MA Teng;WANG Xuejiao(College of Chemistry and Materials Engineering,Bohai University,Jinzhou 121013,China)

机构地区：[1]渤海大学化学与材料工程学院,锦州121013

出　　处：《人工晶体学报》2021年第1期53-59,共7页Journal of Synthetic Crystals

基　　金：国家自然科学基金(51702020);辽宁省教育厅青年育苗项目(LQ2019014);辽宁省自然科学基金(2020-MS-286);大学生创新创业训练计划(202010167010)。

摘　　要：利用自牺牲模板法以一种新型稀土层状化合物(La0.95Eu0.05)2(OH)4SO 4·2H 2O为模板成功合成出(La0.95Eu0.05)F3纳米晶并研究其下转换发光性能。采用X射线衍射仪(XRD)、傅里叶红外变换(FT-IR)、场发射扫描电子显微镜(FE-SEM)及荧光光谱仪对合成产物的物相和荧光性能进行表征。XRD及Rietveld精修结果表明以稀土硝酸盐和硫酸铵为原料在100℃、pH值为9.5的条件下反应24 h可得到稀土层状化合物(La0.95Eu0.05)2(OH)4SO 4·2H 2O模板。自牺牲反应过程中,当模板中稀土离子与氟化铵中氟离子摩尔比为1∶3和1∶5时,在180℃下水热反应24 h可成功合成(La0.95Eu0.05)F3纳米晶。荧光光谱分析表明,(La0.95Eu0.05)F3荧光粉在395 nm的紫外光激发下,分别在591 nm(5D0→7F1跃迁,高强度)、618 nm(5D0→7F2跃迁,中等强度)和692 nm(5D0→7F4跃迁,低强度)处显示下转换发射。所得荧光粉的色坐标为(0.52,0.45),橙红光。荧光粉的主发射峰呈现单指数衰减行为,拟合后发现其荧光寿命约为14 ms。(La0.95Eu0.05)F3 nanocrystals were successfully prepared from a novel(La0.95Eu0.05)2(OH)4SO4·2H2O template via sacrificial template method,and the down conversion photoluminescence were investigated.The phase and luminescence properties of the synthetic products were characterized by X-ray diffraction(XRD),Fourier transform infrared spectroscopy(FT-IR),field emission scanning electron microscopy(FE-SEM),and photoluminescence(PL)spectroscopy.XRD and Rietveld refinement result indicate that(La0.95Eu0.05)2(OH)4SO 4·2H2O template can be obtained using rare earth nitrate and ammonium sulfate as raw materials via hydrothermal reaction at 100℃,pH=9.5 for 24 h.The(La0.95Eu0.05)F3 nanocrystals can be successfully synthesized by sacrificial reaction at 180℃for 24 h when the molar ratio of RE 3+and F-is 1∶3 or 1∶5.Photoluminescence analysis show that under 395 nm ultraviolet excitation,the(La0.95Eu0.05)F3 phosphor show down-conversion emission at 591 nm(5D0→7F1 transition,strong),618 nm(5D 0→7F2 transition,medium strong)and 692 nm(5D 0→7F4 transition,weak),with color coordinates of around(0.52,0.45),orange-red light.The strongest emission is found to decay in a single exponential manner and have fluorescence lifetime of 14 ms.

关 键 词：自牺牲模板法 稀土层状化合物 (La0.95Eu0.05)F3 下转换发光 纳米晶 

分 类 号：O734[理学—晶体学]