Enhancement effect of terbium complex luminescence by binding to silver nanoparticles in the solution

Abstract:

The luminescent properties of terbium complex (terbium citrate) by binding to silver nanopartilces in the solution have been reported in this paper. The enhanced luminescence of the complex containing silver nanoparticies was observed at a limited particle concentration region. The nanoparticle concentration dependence of the luminescent intensity was regarded as the result of a delicate balance between an enhancing and a quenching effect of the silver nanoparticles. Furthermore, silver nanoparticles also affected the asymmetric ratio (AS) value of terbium luminescence. We discuss the luminescent properties of the terbium complex in terms of the local electromagnectic field, refractive index, and the ligand field around terbium ion. Supported by National 973-project (2002CB61306) and National Natural Science Foundation of China (50425204 and 50572043).