摘要: 本论文采用高温固相法以硝酸镨(Pr(NO3)3)、二氧化硅(SiO2)、碳酸锶(SrCO3)、等为原料合成了镨掺杂的二氧化硅荧光材料,并研究了Pr3+浓度对荧光材料发光性能的影响。利用X射线衍射仪(XRD)、荧光光谱仪等测试仪器对样品的结构、物相、形貌、发光性进行表征,研究了影响其发光性的因素,并对其发光机理进行了探讨。研究结果表明:SiO2: Pr(NO3)3材料的最适煅烧温度均为800℃。XRD分析结果表明制备的稀土离子(Pr3+)掺杂的SiO2荧光材料均为正交晶系结构;荧光分析结果表明,样品的激发及发光光谱均为Pr3+的发光,激发峰λmax为440nm,发射峰λmax为610nm,是典型的Pr3+的1D2-3H4引起的。随稀土离子掺杂浓度的增加,荧光的激发和发射强度均呈现先增加后减弱,两者的掺杂Pr3+离子浓度为0.6%时,样品发光强度最强。
关键词:稀土掺杂 ; 高温固相法 ; 发光材料 ; 纳米二氧化硅颗粒8890
Preparation And Characterization of Rare Earth Ions Doped Silica Particles
Abstract : In this paper, high-temperature solid-phase method to praseodymium nitrate (Pr(NO3)3), silicon dioxide (SiO2), strontium carbonate (SrCO3), was synthesized, such as light-emitting materials praseodymium-doped silica, and studied the Pr3+concentration effects on luminescent properties of the material. X-ray diffraction (XRD) and fluorescence spectrometer sample structure, phase, morphology, luminescence characterization. To study the factors that affect its luminescence and luminescence mechanism was discussed. The results showed that: SiO2: optimum calcination temperature Pr(NO3)3materials are 800℃. XRD analysis showed that (the measured sample card in line with international standards.) Preparation of rare earth ions (Pr3+) doped SiO2 structural materials are triclinic structure; fluorescence analysis showed that with the increase in the concentration of rare earth ions doped , the fluorescence emission intensity decreased first and then increased doping Pr3+ ion concentration 7mol%, the luminescence intensity of the strongest.
Keywords :Rare-earth doped ; High-temperature solid-phase method ;Luminescent material ; Nano-particles SiO2
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