Citation:
WANG Yue-Hui, WANG Ting, ZHOU Ji. Effects of Silver Nanoparticles on the Luminescent Properties of Europium Complex[J]. Chinese Journal of Inorganic Chemistry,
;2014, 30(5): 1179-1186.
doi:
10.11862/CJIC.2014.161
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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.
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