| 纳米银对铕配合物荧光性质的影响 |
| Effects of Silver Nanoparticles on the Luminescent Properties of Europium Complex |
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| 摘要: 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。 |
| 关键词: 铕配合物 纳米银 荧光增强 表面等离子体共振 局域电磁场 |
| 基金项目: 国家自然科学基金（No.61302044）和广东省自然科学基金（No.S2012010010646）资助项目。 |
| Abstract: Adetailed study of the effects of silver nanoparticles on the luminescent properties of the europium complex (Eu(Ⅲ)C7H5NO4, Eu(Ⅲ)DPA), where DPAis dipicolinic acid, in the aqueous solution system was reported. The emission intensity of the Eu(Ⅲ)DPA solution initially increased with increasing of the amount of silver colloids and then decreased. The large silver nanoparticles resulted in the high enhancement efficiency and the low amount at which the enhancement efficiency reaches the maximum. The emission intensity was quenched by silver nanoparticles in high concentration of Eu(Ⅲ)DPA solution. The enhancement for the emission of electric dipole transition was stronger than that of magnetic dipole transition. The observed silver nanoparticles dependences of the luminescent intensity were regarded as the result of a stronger coupling between the surface plasmon resonance and the excited luminescence centers and re-absorption of surface plasmon resonance of silver nanoparticles. Meanwhile, the asymmetric ratio of the europium luminescence affected by silver nanoparticles was discussed in terms of the local electromagnetic field enhancement, refractive index, and the ligand field around europium ion. |
| Keywords: europium complex silver nanoparticles luminescence enhancement surface plasmon resonance local electromagnetic field |
| 投稿时间：2013-08-30 修订日期：2013-12-12 |
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| 王悦辉,王婷,周济.纳米银对铕配合物荧光性质的影响[J].无机化学学报,2014,30(5):1179-1186. |
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