Luminescence enhancement mechanism of Er³⁺ ions by Ag@SiO₂ core-shell nanostructure in tellurite glass

In this paper, we introduce a prefabricabed Ag@SiO₂ nanostructure directly into tellurite luminescence glass composed of 70TeO₂-25ZnO-5La₂O₃-0.5Er₂O₃. We find that the maximum enhancement of visible and infrared excitation spectra intensity of (A) Ag (1.6×10⁻⁶ mol/L)@SiO₂(40 nm) @Er³⁺ (0.5%): tellurite glass relative to (B) Er³⁺ (0.5%): tellurite glass is about 149.0% and 161.5%, respectively. Their maximum enhancement of visible and infrared luminescence spectra intensity is 155.2% and 151.6%, respectively. We also find that sample (A) has a larger lifespan compared to sample (B). Because the surface plasmon absorption peak of Ag@SiO₂ is located at 546.0 nm, it completely resonates with the luminescence peak of erbium ions which are also at 546.0 nm. Therefore, the resonance enhancement action of Ag@SiO₂ on the luminescence of erbium-doped tellurite luminescence glass is significant. Thanks to the advantages of the step-by-step realization of the silver nano core-shell structure and the production of glass, it can successfully and smoothly control the size of Ag@SiO₂. It also has the advantage of strong operability in the manufacturing process of Ag@SiO₂@Er: telluride luminescence glass. Its costs are also minor. Moreover, it can not only ensure that the silver is not oxidized, but it can also successfully control the distance between the rare earth ion luminescence center and the silver surface plasma. It can also successfully reduce the back energy transfer, which allows the silver surface plasma to more effectively enhance the intensity of photo-luminescence.