Luminescence Of Tb~(3+) Doped Teo_2-zno-na_2o-pbo Glasses Containing Silver Nanoparticles

摘要

Luminescence properties of Tb~(3+) doped TeO_2-ZnO-Na_2O-PbO glasses containing silver nanoparticles (NPs) were investigated. The absorption band due to the surface plasmon resonance in the NPs was observed. Its amplitude increases with the heat treatment of the samples that controls the nucleation of the NPs. Tb~(3+) emission bands centered at ≈ 485, ≈ 550, ≈ 585, and ≈ 623 nm were detected for excitation at 377 nm. The whole spectrum is intensified by the appropriate annealing time of the samples. Enhancement by ≈ 200% of the Tb~(3+) luminescence at 550 nm was observed for samples annealed at 270 ℃ during 62 h. This enhancement effect is due to the local field amplitude that increases with the amount of silver NPs and their aggregates.