LaAlO3 Hollow Spheres: Synthesis and Luminescence Properties
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- 作者：Biaohua Chen ; Jianfei Yu ; Xin Liang
- 刊名：Langmuir
- 出版年：2011
- 出版时间：September 20, 2011
- 年：2011
- 卷：27
- 期：18
- 页码：11654-11659
- 全文大小：880K
- 年卷期：v.27,no.18(September 20, 2011)
- ISSN：1520-5827
文摘
Nearly monodisperse LaAlO3 hollow spheres are synthesized by a novel precursor thermal decomposition method. Spherical colloids of capsulelike precursors with uniform diameters of 273 卤 35 nm have been synthesized by a solvothermal method. These spherical colloids could convert to LaAlO3 hollow spheres with diameters of 166 卤 26 nm by a thermal decomposition process. The thermal transformation process from the precursors to LaAlO3 was characterized by thermogravimetric 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鈥搗is 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.