Citation: WANG Yue-Hui, WANG Ting, ZHOU Ji. Studies of Enhanced Fluorescence Effects of Europium(Ⅲ) Dipicolinic Acid Complex by Silver Nanoparticles[J]. Acta Physico-Chimica Sinica, ;2014, 30(1): 28-33. doi: 10.3866/PKU.WHXB201311011
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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 (5D0→7F2)and magnetic dipole transition (5D0→7F1) first increased and then decreased, and the enhancement efficiency of 5D0→7F2 was higher than that of 5D0→7F1. 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.
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