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 shu

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

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 Date: 22 July 2013
Available Online: 1 November 2013
Fund Project: 国家自然科学基金(61302044)，广东省自然科学基金(S2012010010646) (61302044)，广东省自然科学基金(S2012010010646)电子科技大学中山学院科研启动基金(407YKQ06)资助项目 (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 (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.
- Silver nanoparticle,
- Europium complex,
- Localized surface plasmons resonance,
- Enhanced fluorescence,
- Solvent
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