The authors report the infrared-to-visible frequency upconversion (UPC) process in Er3+ doped PbO–GeO2 glasses containing silver nanoparticles (NPs) with an average diameter of 2.2nm. The absorption spectra of the samples present a band centered at 470nm due to the surface plasmons associated with the NPs. The intensity of the band grows with increasing NP concentration. The experiments were performed by exciting the samples with a 980nm diode laser and observing the UPC emissions in the red-green region. The enhanced UPC intensity is attributed to the local field effect in the proximity of the NPs.
We studied the influence of silver nanoparticles (NPs) in the luminescence properties of TeO2–PbO–GeO2 glass doped with trivalent praseodymium (Pr3+) ions. The experiments were performed with samples containing different concentrations of NPs controlled by heat treatment of the glass. The enhancement of the Stokes luminescence with the increase of the NPs concentration was observed for samples excited at 454nm. The influence of the NPs on the frequency upconversion (anti-Stokes) emissions of Pr3+ under excitation at 520nm was also investigated. In this case, enhancement of the emissions around 460 and 486nm was observed and the excitation pathway is also discussed.
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