Acta Phys. -Chim. Sin. ›› 2014, Vol. 30 ›› Issue (1): 28-33.doi: 10.3866/PKU.WHXB201311011


Studies of Enhanced Fluorescence Effects of Europium(Ⅲ) Dipicolinic Acid Complex by Silver Nanoparticles

WANG Yue-Hui1, WANG Ting2, ZHOU Ji3   

  1. 1 Department of Chemistry and Biology Engineering, University of Electronic Science and Technology of Zhongshan Institute, Zhongshan 528402, Guangdong Province, P. R. China;
    2 Beijing General Research Institute for Nonferrous Metals, Beijing 100088, P. R. China;
    3 State Key Laboratory of New Ceramics and Fine Processing, Department of Materials Science and Engineering, Tsinghua University, Beijing 100084, P. R. China
  • Received:2013-07-22 Revised:2013-11-01 Published:2014-01-01
  • Contact: WANG Yue-Hui
  • Supported by:

    The project was supported by the National Natural Science Foundation of China (61302044), Natural Science Foundation of Guangdong Province, China (S2012010010646), and Scientific Research Initial Foundation of University of Electronic Science and Technology of Zhongshan Institute, China (407YKQ06).


The enhanced fluorescence effect of silver nanoparticles on a europium complex, Eu(Ⅲ)DPA, where DPA is dipicolinic acid (C7H5NO4), with deionized (DI) water, heavy water, ethanol, and dimethylformamide as solvents, was studied. The results indicated that with increasing silver nanoparticle concentration, the intensities of the electric dipole transition (5D07F2)and magnetic dipole transition (5D07F1) first increased and then decreased, and the enhancement efficiency of 5D07F2 was higher than that of 5D07F1. The enhanced fluorescence effect of silver nanoparticles on Eu(Ⅲ)DPA was maximum in ethanol. In the DI water, heavy water, and ethanol solution systems, the asymmetric ratio increased significantly, but there was little change in the dimethylformamide solution system. The observed silver nanoparticle dependence of the luminescent intensity of Eu(Ⅲ)DPA was considered to be the result of stronger coupling between the surface plasmon resonance and the excited luminescence centers, and reabsorption of the surface plasmon resonance of silver nanoparticles.

Key words: Silver nanoparticle, Europium complex, Localized surface plasmons resonance, Enhanced fluorescence, Solvent


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