LaAlO3 Hollow Spheres: Synthesis and Luminescence Properties
LaAlO3 Hollow Spheres: Synthesis and Luminescence Properties
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LaAlO3 空心球：合成和发光性能
DOI：
10.1021/la201889n
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发表时间：
2011-09-20
期刊：
影响因子：
3.9
通讯作者：
Liang, Xin
中科院分区：
文献类型：
--
作者：
Chen, Biaohua;Yu, Jianfei;Liang, Xin
用一种新的前驱体热分解法合成了近单分散的LaAlO 3空心球。用溶剂热法合成了直径为273 ± 35 nm的球形前驱体胶体。这些球形胶体可以通过热分解过程转化为直径为166 +/- 26 nm的LaAlO 3空心球。采用热重分析（TGA）、X射线衍射（XRD）和傅里叶变换红外光谱（FT-IR）等手段对前驱体向LaAlO 3的热转化过程进行了表征。通过掺杂不同的稀土离子（Sm 3+、Eu 3+和Tb 3+），LaAlO 3空心微球的发光可以从红色调谐到绿色。特别是LaAlO 3发光空心球在乙醇、水等极性溶剂中能很好的分散，拓宽了其潜在的应用范围。紫外-可见吸收光谱显示在211、223和313 nm处的能量吸收对应于主体晶格吸收和电荷转移跃迁。结果与激发光谱中观察到的峰符合得很好。
Nearly monodisperse LaAlO3 hollow spheres are synthesized by a novel precursor thermal decomposition method Spherical colloids of capsulelike precursors with uniform diameters of 273 +/- 35 nm have been synthesized by a solvethermal method. These spherical colloids could convert to LaAlO3 hollow spheres with diameters of 166 +/- 26 nm by a thermal decomposition process. The thermal transformation process from the precursors to LaAlO3 was characterized by thermo- gravimetric analysis (TGA), X-ray diffraction (XRD), and the Fourier transform infrared spectroscopy (FT-IR). By the doping of various lanthanide ions (Sm3+, Eu3+, and Tb3+), the emission luminescence of lanthanide-doped LaAlO3 hollow microspheres can be tuned from red to green. In particular, these luminescent LaAlO3 hollow spheres Can be well dispersed in polar solvents such as the ethanol and water, Which broadens the range of potential applications of these hollow spheres. The UV-vis absorption spectra show energy absorption at 211,223, and 313 nm corresponding to the host lattice absorption and Charge-transfer transitions. The results are in good agreement with the peaks observed in the excitation spectra.