Department of Chemistry, University of Texas-Pan American, Edinburg, TX 78539, USA.
Nanotechnology. 2014 Jan 17;25(2):025703. doi: 10.1088/0957-4484/25/2/025703. Epub 2013 Dec 12.
Novel heterostructured La2Zr2O7:Eu(3+)@YBO3 core@shell nanoparticles (NPs) composed of a trivalent europium doped lanthanum zirconate (La2Zr2O7:Eu(3+)) core and yttrium orthoborate (YBO3) shell are reported in this paper for the first time. X-ray diffraction, Fourier transform infrared spectroscopy, scanning and transmission electron microscopies, and x-ray photoelectron spectroscopy were employed to confirm the formation of the heterostructured core@shell NPs. Luminescent enhancement was observed after the La2Zr2O7:Eu(3+) core NPs were coated with the thin YBO3 shells under 405 nm excitation. Based on optical transition property analysis and fluorescent decay measurement, the reduction of non-radiative transition rate is possibly responsible for the luminescent enhancement. Moreover, an improvement of the symmetry around the Eu(3+) ions in the La2Zr2O7:Eu(3+) core NPs was found after the YBO3 shell coating.
本文首次报道了由三价铕掺杂的镧锆酸（La2Zr2O7:Eu(3+））核和氧化硼钇（YBO3）壳组成的新型杂化结构 La2Zr2O7:Eu(3+）@YBO3 核壳纳米粒子（NPs）。采用 X 射线衍射、傅里叶变换红外光谱、扫描和透射电子显微镜以及 X 射线光电子能谱对杂化核壳 NPs 的形成进行了确认。在 405nm 激发下，La2Zr2O7:Eu(3+）核 NPs 涂覆薄的 YBO3 壳后，观察到了发光增强。基于光学跃迁特性分析和荧光衰减测量，非辐射跃迁速率的降低可能是发光增强的原因。此外，在 YBO3 壳涂覆后，La2Zr2O7:Eu(3+）核 NPs 中 Eu(3+）离子周围的对称性得到了提高。
