Guorui Wang

Publications (2)2.23 Total impact

• Source

  Available from: semi.ac.cn

  Article: Enhanced raman scattering of ZnO quantum dots on silver colloids

  Guiye Shan, Lihong Xu, Guorui Wang, Yichun Liu
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  ABSTRACT: Enhancement of the Raman signals of ZnO quantum dots on Ag colloids was studied. Unique ZnO/Ag nanostructure materials were obtained by self-assembly of Ag nanocrystals using ZnO nanoparticles as seeds. The morphology and optical properties of ZnO/Ag core/shell particles are dependent on the quality of deposited Ag. The surface plasmon absorption band of Ag shifts toward lower energy due to the interaction between Ag and ZnO quantum dots. The intensities and orders of multiphonon fingerprint Raman lines of ZnO nanocrystals were increased remarkably from the effect of Ag. The efficient quantum dot excitation within the locally enhanced electromagnetic field produced by the silver nanoparticles is evidenced by the observation of the surface plasmon resonance in the enhanced Raman of ZnO nanocrystals.
• Article: Synthesis and luminescence properties of Eu3+-doped ZnO nanocrystals by a hydrothermal process

  Mingya Zhong, Guiye Shan, Yajun Li, Guorui Wang, Yichun Liu
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  ABSTRACT: Trivalent europium ions doped zinc oxide (ZnO:Eu3+) nanocrystals were prepared by a hydrothermal process. The obtained samples were characterized using X-ray diffraction (XRD) and photoluminescence (PL) spectra. The XRD patterns indicate that Eu3+ ions are successfully doped into the crystal lattice of ZnO matrix. The ZnO:Eu3+ nanocrystals exhibit a sharp red luminescence emission, which is from the intra-4f transitions of Eu3+ ions. The 5D0–7F2 emission comes from an allowed electric-dipole transition and its intensity is the strongest. This implies that Eu3+ ions are mainly in a large transition probability in the crystal field with inversion antisymmetry. The PL peaks of Eu3+ ions can be observed even under the nonresonant excitation of 325 nm. It is explained by an energy transfer mechanism in which the energy is transferred from the defect state of ZnO matrix to Eu3+ ions in ZnO:Eu3+ nanocrystals.
  Materials Chemistry and Physics 106:305-309. · 2.23 Impact Factor