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采用乙二胺四乙酸(ethylene diamine tetraacetic acid,EDTA)络合溶胶-凝胶法制备掺杂Ce3+的BaHfO3纳米粒子。用热重-差热分析、X射线衍射、扫描电镜、透射电镜及荧光光度仪等手段表征样品的物相、形貌及光谱特性,分析Ce3+在BaHfO3基体中的固溶行为。结果表明:添加乙二醇条件下制备的前驱体,经900℃煅烧2 h可得到晶化完全的BaHfO3:Ce3+纳米粒子;样品形貌为近似球形、粒径分布均匀,粒子尺寸约30 nm;Ce3+摩尔(下同)掺量为0.9%时,Ce3+能均匀地固溶在BaHfO3基体中且发光性能最好;Ce3+掺量大于0.9%时,出现发光浓度淬灭现象,发光特征峰强度降低。
The Ba3 + -doped BaHfO3 nanoparticles were prepared by a complex sol-gel method with ethylene diamine tetraacetic acid (EDTA). Thermogravimetry - differential thermal analysis, X - ray diffraction, scanning electron microscopy, transmission electron microscopy and fluorescence spectroscopy were used to characterize the phase, morphology and spectral properties of the samples. The solid solution behavior of Ce3 + in BaHfO3 matrix was analyzed. The results show that BaHfO3: Ce3 + nanoparticles with complete crystallinity can be obtained by calcination at 900 ℃ for 2 h. The morphology of the sample is nearly spherical and the particle size is about 30 nm. When the content of Ce3 + is 0.9%, Ce3 + can be uniformly dissolved in BaHfO3 matrix with the best luminescence property. When the content of Ce3 + is more than 0.9%, the luminescence quenching phenomenon occurs and the intensity of the emission peak decreases.