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10 September 2010 Plasmon enhanced luminescence of Tb3+ doped Li2O-LaF3-Al2O3-SiO2 glass containing Ag nanoparticles
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Tb3+ and Ag co-doped glass nano-composites are synthesized in a glass matrix Li2O-LaF3-Al2O3-SiO2 (LLAS) by a melt-quench technique. The nucleation and growth of Ag nanoparticles (NPs) were controlled by a thermal annealing process. A broad absorption band peaking at about 420 nm was observed due to surface plasmon resonance (SPR) of Ag NPs. Annealing of glass samples results in the growth of Ag NPs. Photoluminescence (PL) emission and excitation spectra were measured from glass samples with different Ag concentrations and different annealing times. Plasmon enhanced Tb3+ luminescence was observed at certain excitation wavelength regions. Luminescence quenching was observed for samples with high Ag concentration and longer annealing time. Our luminescence results suggest that there are two competitive effects, enhancement and quenching, acting on Tb3+ luminescence in the presence of Ag NPs. The enhancement of Tb3+ luminescence is mainly attributed to local field effects: the SPR of Ag NPs causes an intensified electromagnetic field around the NPs, resulting in enhanced optical transitions of Tb3+ ions in the vicinity. The quenching effect in the presence of Ag NPs suggests an energy transfer from Tb3+ ions to Ag NPs. The competition between the plasmonic enhancement and the quenching effect is discussed for samples with different Ag concentrations and annealing times.
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P. Piasecki, A. Piasecki, Zhengda Pan, Akira Ueda, R. Aga Jr., Richard Mu, and Steven H. Morgan "Plasmon enhanced luminescence of Tb3+ doped Li2O-LaF3-Al2O3-SiO2 glass containing Ag nanoparticles", Proc. SPIE 7757, Plasmonics: Metallic Nanostructures and Their Optical Properties VIII, 77572M (10 September 2010);

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