Eu3+掺杂的LaBO3荧光粉制备及发光性能
Synthesis and Luminescence Properties of Eu3+ doped LaBO3 Phosphors
作者单位E-mail
侯晓飞 沈阳化工大学材料科学与工程, 沈阳 110142  
赵婉男 沈阳化工大学材料科学与工程, 沈阳 110142  
马晶 沈阳化工大学材料科学与工程, 沈阳 110142  
孙继强 沈阳化工大学材料科学与工程, 沈阳 110142  
李艳红 沈阳化工大学材料科学与工程, 沈阳 110142 lyhciom@126.com 
摘要: 采用水热法合成前驱体,后经热处理方式制备不同晶相的LaBO3∶Eu3+荧光粉。通过X射线衍射(XRD)、电子扫描电镜(SEM)、红外光谱和荧光光谱对样品的结构、形貌和发光性能进行了研究。并研究了硼酸用量、热处理温度及初始溶液pH等对晶相结构和发光性能的影响。XRD研究结果表明:合成样品具有单斜结构、正交结构及单斜和正交两相混合结构。适当的硼酸用量、较高的热处理温度及较高的初始溶液pH值易于获得正交结构的荧光粉。红外光谱显示:pH值和硼酸用量影响前驱体成分,热处理温度影响晶相的转变。SEM结果显示:LaBO3∶Eu3+荧光粉的晶粒尺寸随着pH值的增加逐渐减小,与XRD计算结果相一致。荧光光谱结果表明:正交结构的LaBO3∶Eu3+发光粉具有较高的紫外吸收和较为纯正的红色发射强度。
关键词: 荧光粉  LaBO3:Eu3+  水热法  热处理  发光
基金项目: 辽宁省教育厅科学技术研究项目(No.LJ2019002)资助。
Abstract: LaBO3:Eu3+ phosphors with different crystal phase were prepared by heat treatment precursor prepared by hydrothermal method. The structure, morphology and luminescence properties of the samples were characterized with X-ray diffraction (XRD), field emission scanning electron microscopy (SEM), infrared spectroscopy and fluorescence spectroscopy. The effects of boric acid dosage, heat treatment temperature, and initial solution pH of precursor on structure and luminescence properties of the samples were studied. The results of XRD showed that the phosphors with orthogonal structure, monoclinic structure and both phase mixed structure can be obtained. LaBO3 with pure orthogonal structure can be obtained by heating treatment at 700℃ for precursors synthesized with initial solution pH=8 and molar ratio of rare earth ions to boric acid of 1:3 and 1:4, respectively. It is convenient to obtained phosphors with orthogonal structure at proper boric acid dosage, higher heat treatment temperature and higher initial solution pH value. Infrared spectra showed that the change of initial solution pH and boric acid dosage effected the composition of precursor, and the heat treatment temperature effected the crystal phase transformation. SEM showed that particle size of LaBO3:Eu3+ phosphor decreased with the increase of initial solution pH, which were consistent with the results calculated from XRD. The excitation spectra of samples consisted of the broad band in a range of 200~350 nm and another weak narrow lines in a range of 350~450 nm, which were assigned to O2--Eu3+ charge transfer band and f-f transitions of Eu3+ ions, respectively. The emission spectra of samples consisted of sharp lines ranging from 500 to 750 nm, which are associated with the transitions from the excited 5D0-7FJ (J=1, 2, 3, 4) of Eu3+ ions. The main emission peak at 615 nm was due to the 5D0-7F2 transitions of Eu3+, the peak at 593 nm was attributed to 5D0-7F1 transitions of Eu3+. The excitation and emission intensities are related to the structure of the samples. LaBO3:Eu3+ with orthogonal structure has higher ultraviolet absorption and higher emission intensity with pure red light.
Keywords: phosphors  LaBO3:Eu3+  hydrothermal method  heat treatment  luminescence
投稿时间:2019-08-03 修订日期:2019-11-08
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侯晓飞,赵婉男,马晶,孙继强,李艳红.Eu3+掺杂的LaBO3荧光粉制备及发光性能[J].无机化学学报,2020,35(2):276-282.
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