Influence of Optical Properties of Ag NPs from Raphanus sativus Leaf Extract on Lanthanide Complexes
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Simple rapid green synthesis route using Raphanus sativus leaf extract as reducing and stabilizing agent produced silver nanoparticles (Ag NPs) at room temperature. The formation of Ag NPs has been characterized and confirmed through TEM, XRD, FTIR and UV-visible absorption spectrum. Luminescence enhancement was observed only for few particular concentrations of Eu3+ and Sm3+ ions in Ag NPs. Enhancement of luminescence might be due to the increase in the electric dipole transition rate with the variation of local environment surrounding Ln3+ ions. Lifetimes of Ln3+ ions were found to increase with increase in Ag NP concentration to certain extent but found to decrease with further increase in Ag NPs. Nonlinear absorption behaviours in the picosecond (ps) and femtosecond (fs) time domains were studied by using the Z-scan technique. Third-order susceptibility was measured with ultrafast nonlinear optical response in the fs regime by using degenerate four-wave mixing (DFWM). High luminescence enhancement factors and good nonlinear optical properties of the biosynthesized Ag NPs have applications in biology and optics.
KeywordsBiosynthesis Silver nanoparticles Raphanus sativus leaf extract Luminescence Nonlinear optical properties Optical limiting
E. Ramya sincerely acknowledges the University Grant Commission-Basic Scientific Research (UGC-BSR), India, for senior research fellowship. Dr. L. Jyothi acknowledges UGC for women post-doctoral fellowship and DST for equipment grant through Fast Track Scheme for Young Scientists. The authors also acknowledge C. Viswanath from Prof. C.K. Jayasankar’s group, Sri Venkateswara University, Tirupati, India, for rendering help in decay measurements using a FLS 980 instrument.
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