Jiang Daixun, Cao Lixin, Liu Wei, Su Ge, Qu Hua, Sun Yuanguang, Dong Bohua
Institute of Materials Science and Engineering, Ocean University of China, Qingdao, 266100 People's Republic of China.
Nanoscale Res Lett. 2009 Jan;4(1):78-83. doi: 10.1007/s11671-008-9205-6. Epub 2008 Nov 26.
In this paper the influence of ZnO shell thickness on the luminescence properties of Mn-doped ZnS nanoparticles is studied. Transmission electron microscopy (TEM) images showed that the average diameter of ZnS:Mn nanoparticles is around 14 nm. The formation of ZnO shells on the surface of ZnS:Mn nanoparticles was confirmed by X-ray diffraction (XRD) patterns, high-resolution TEM (HRTEM) images, and X-ray photoelectron spectroscopy (XPS) measurements. A strong increase followed by a gradual decline was observed in the room temperature photoluminescence (PL) spectra with the thickening of the ZnO shell. The photoluminescence excitation (PLE) spectra exhibited a blue shift in ZnO-coated ZnS:Mn nanoparticles compared with the uncoated ones. It is shown that the PL enhancement and the blue shift of optimum excitation wavelength are led by the ZnO-induced surface passivation and compressive stress on the ZnS:Mn cores.
本文研究了ZnO壳层厚度对Mn掺杂ZnS纳米颗粒发光性能的影响。透射电子显微镜（TEM）图像显示，ZnS:Mn纳米颗粒的平均直径约为14nm。通过X射线衍射（XRD）图谱、高分辨率TEM（HRTEM）图像和X射线光电子能谱（XPS）测量证实了在ZnS:Mn纳米颗粒表面形成了ZnO壳层。随着ZnO壳层增厚，室温光致发光（PL）光谱中出现先强烈增加后逐渐下降的现象。与未包覆的相比，ZnO包覆的ZnS:Mn纳米颗粒的光致发光激发（PLE）光谱表现出蓝移。结果表明，PL增强和最佳激发波长的蓝移是由ZnO诱导的表面钝化和ZnS:Mn核上的压应力导致的。
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