高介电基质钙钛矿结构对稀土发光性能的影响

发布时间：2019-01-01 19:55

【摘要】：采用高温固相烧结法制备出结晶良好的BaTiO3，掺杂稀土Eu对其改性，制得有一定光学性能的发光粉体。通过对比实验发现Eu最优含量，采用荧光光谱仪测试粉体的发光性能。在实验设定的五组对比数据中，Eu的含量分别为0.2%，0.4%，0.6%，0.8%和1.0%。发现随着Eu含量的增大粉体发光强度增大，到0.8%时达到最大，超过0.8%时发光强度开始下降。这是因为稀土掺杂量很少，当超过一定浓度之后会发生浓度猝灭现象，会降低发光粉体的发光强度。在本实验中，从粉体发光性能的角度看，，Eu的最佳含量是0.8%。实验中发现五组粉体的最高发射峰均位于695nm，最高激发峰均位于352nm。向BaTiO3+3:Eu中引入ZrO2制备BaTi1-xZrxO3:Eu3+发光粉体。实验设定五组对比数据，其中ZrO2的含量分别为0，10%，20%，30%，40%。使用荧光光谱仪测试粉体的发射光谱和激发光谱，发现随着ZrO+2含量的增大粉体的发光强度下降。纯BaTiO3:Eu3的发光强度最高，BaTi0.6Zr0.4O3:Eu3+的发光强度最低。五组粉体的最高发射峰均位于702nm，最高激发峰均位于351nm。将制备的BaTi1-xZrxO3:Eu3+发光粉体压片成型烧结成陶瓷，然后被银检测其介电常数。检测后发现随着ZrO2含量的增大样品的介电常数减小。五组样品中，纯BaTiO3+3:Eu的介电常数最大，达到1710；BaTi30.6Zr0.4O3:Eu+陶瓷的介电常数最小，为973。将BaTi1-xZrxO3:Eu3+发光粉体的发光强度变化和BaTi1-xZrxO+3:Eu3陶瓷的介电常数变化联系在一起之后发现，粉体的发光性能随着其对应陶瓷的介电常数变化而变化。
[Abstract]:The luminescent powder with good optical properties was prepared by high temperature solid state sintering method, which was modified by BaTiO3, doped rare earth Eu. The optimum content of Eu was found by contrast experiment, and the luminescence property of the powder was tested by fluorescence spectrometer. In the five sets of data, the content of Eu was 0. 2% and 0. 6%, 0. 6% and 1. 0%, respectively. It is found that the luminescence intensity of the powder increases with the increase of Eu content, reaches the maximum at 0.8 and begins to decrease when the content of Eu exceeds 0.8. This is because the rare earth doping amount is very small, when the concentration exceeds a certain concentration, the concentration quenching phenomenon will occur, which will reduce the luminescence intensity of the luminescent powder. In this experiment, the optimum content of Eu is 0.8% from the point of view of luminescent properties of powder. It was found that the highest emission peaks and excitation peaks of the five groups of powders were both located at 695nmand 352nmrespectively. BaTi1-xZrxO3:Eu3 luminescent powder was prepared by introducing ZrO2 into BaTiO3 3:Eu. Five groups of comparative data were set, of which the content of ZrO2 was 0, 10, 20, 30 and 40, respectively. The emission and excitation spectra of the powder were measured by fluorescence spectrometer. It was found that the luminescence intensity of the powder decreased with the increase of ZrO _ 2 content. The luminescence intensity of pure BaTiO3:Eu3 is the highest, and that of BaTi0.6Zr0.4O3:Eu3 is the lowest. The highest emission peaks and excitation peaks of the five groups of powders are all located at 702nmand 351nmrespectively. The prepared BaTi1-xZrxO3:Eu3 luminescent powder was formed and sintered into ceramics, and then its dielectric constant was measured by silver. It was found that the dielectric constant decreased with the increase of ZrO2 content. The dielectric constant of pure BaTiO3 3:Eu was the highest, and the dielectric constant was the smallest (973) in 1710% BaTi30.6Zr0.4O3: EU ceramics. It is found that the luminescence properties of BaTi1-xZrxO3:Eu3 powders vary with the dielectric constant of BaTi1-xZrxO 3:Eu3 ceramics.
【学位授予单位】：沈阳工业大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TQ174.1

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