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研究了纳米银对稀土铕-吡啶-2,6-二羧酸配合物(Eu(Ⅲ)C7H5NO4,Eu(Ⅲ)DPA)的荧光性质的影响。随着纳米银浓度增加,荧光强度先增强而后逐渐下降。较大粒径的纳米银使Eu(Ⅲ)DPA荧光增强效率较大,且达到最大荧光增强效率所需的纳米银浓度较低。在高浓度Eu(Ⅲ)DPA溶液体系中,纳米银导致荧光猝灭。电偶极子跃迁发射荧光增强效率大于磁偶极子跃迁发射荧光增强效率。分析认为,纳米银对Eu(Ⅲ)DPA荧光性质的影响与表面等离子体共振与激发态荧光中心强烈耦合以及表面等离子体再吸收有关。同时,纳米银对铕配合物的不对称率有影响,其影响因素与局域电磁场增强,折射率以及配位场有关。
The effects of nano-silver on the fluorescence properties of rare earth europium-pyridine-2,6-dicarboxylic acid complexes (Eu (Ⅲ) C7H5NO4, Eu (Ⅲ) DPA) were studied. As the concentration of silver nanoparticles increased, the fluorescence intensity first increased and then decreased gradually. The nanosilver with larger size makes the fluorescence enhancement of Eu (Ⅲ) DPA more efficient and the concentration of nanosilver needed to reach the maximum fluorescence enhancement efficiency is lower. In the high concentration of Eu (Ⅲ) DPA solution system, silver nanoparticles lead to fluorescence quenching. The electric dipole transition emission fluorescence enhancement efficiency is greater than the magnetic dipole transition emission fluorescence enhancement efficiency. The analysis shows that the effect of nanosilver on the fluorescence properties of Eu (Ⅲ) DPA is strongly related to the strong coupling between surface plasmon resonance and the excited state fluorescence center and the surface plasmon reabsorption. Meanwhile, the nano-silver has an influence on the asymmetry of the europium complex, and its influencing factors are related to the enhancement of the local electromagnetic field, the refractive index and the coordination field.