稀土氧化物与氟化物纳米结构的可控制备及荧光性能
本文选题：AAO模板 + 稀土氧化物 ； 参考：《安徽大学》2015年硕士论文
【摘要】：本文利用负压抽滤法,在氧化铝模板(AAO)纳米阵列孔道内构筑了稀土氧化物CeYbxOy和稀土氟化物LaxY1-xF3纳米结构。在水,乙二醇混合溶剂中,以水热合成法制备了NaYF4纳米粉体。用扫描电镜(SEM)、透射电镜(TEM)、X-射线衍射仪(XRD)、能量散射光谱仪(EDS)表征了它们的形貌、结构及其化学组成。以荧光光谱仪(F.-4500)研究CeYbxOy:Eu3+,LaxY1-xF3:Eu3+的荧光特性,讨论了激发光波长和Eu掺杂浓度与其荧光强度的关系。主要研究结果如下：1.研究了Eu3+掺杂浓度对CeYbxOy纳米线阵列荧光强度的影响,结果表明,以394nm为激发波长,CeYbxOy:Eu3+纳米线阵列在593nm出现一个强发射峰,对应于Eu3+的5D0→7F1跃迁,当以摩尔比8%的Eu3+掺杂时,CeYbxOy:Eu3+纳米线荧光强度最强。2.研究比较了Eu3+掺杂的LaxYi-3纳米管、纳米线、纳米粉体的荧光强度,结果表明,它们在593 nm和711 nm处,上述纳米结构都有荧光发射峰,对应于Eu3+的(5D0→7F1)和(5D0→7F4)跃迁,Eu3+掺杂浓度相同时,La,Y1-xF3:Eu3+纳米管结构的荧光强度最强,LaxYi-xF3:Eu3+纳米粉体荧光强度最弱,且Eu3+最佳掺杂浓度的摩尔比6%。3.研究了水热合成反应条件对NaYF4纳米粉体的晶型、形貌、颗粒大小的影响。调控反应条件,可以获得立方相结构的NaYF4纳米晶。
[Abstract]:In this paper, rare earth oxide (CeYbxOy) and rare earth fluoride (LaxY1-xF3) nanostructures were constructed in the pores of alumina template AAOs by negative pressure filtration method.Nano-sized NaYF4 powders were prepared by hydrothermal synthesis in water and ethylene glycol mixed solvent.Their morphology, structure and chemical composition were characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM) and energy scattering spectroscopy (EDS).The fluorescence characteristics of CeYbxOy:Eu3 LaxY1-xF3: EU3 were studied by means of fluorescence spectrometer F.-4500. The relationship between the excitation wavelength and EU doping concentration and the fluorescence intensity was discussed.The main results are as follows: 1.The effect of doping concentration of Eu3 on the fluorescence intensity of CeYbxOy nanowire array was studied. The results show that there is a strong emission peak in 593nm with 394nm as excitation wavelength, corresponding to the 5D0 7F1 transition of Eu3.The fluorescence intensity of CeYbx Oy: EU3 nanowires is the strongest when the molar ratio of Eu3 is 8%.The fluorescence intensities of Eu3 doped LaxYi-3 nanotubes, nanowires and nano-powders were compared. The results showed that the fluorescence emission peaks were observed at 593nm and 711nm.The fluorescence intensity of LaxYi-xF3: EU3 nanotube structure is the weakest, and the molar ratio of the optimum doping concentration of Eu3 is 6.3.When the transition EU _ 3 doping concentration is the same, the fluorescence intensity of LaxYi-xF3: EU3 nanotube structure is the weakest.The effects of hydrothermal synthesis conditions on the crystal shape, morphology and particle size of NaYF4 nano-powders were studied.NaYF4 nanocrystals with cubic structure can be obtained by adjusting the reaction conditions.
【学位授予单位】：安徽大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TB383.1;TQ133.3
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