Germanate-tellurite glasses with low Er 3+ions concentration and their radiative emissions

Rare -earth -doped glasses have garnered significant interest in photonics and optical communication due to their unique luminescent properties. Nevertheless, is important to understand what means low content of Er 3+ ions in germanate-tellurite glasses, since when there are few Er 3+ ions in a glass matrix, these ions could be approximated with quantum emitters. The existing literature predominantly focuses on high doping concentrations of Er 3+ ions in glasses, overlooking the subtleties and advantages associated with low doping contents. This research addresses this gap by exploring the optical and structural properties in germanatetellurite glasses doped with low concentrations of Er 3+ ions. Optical spectroscopy techniques were employed to characterize the luminescent properties and additionally, structural analysis was conducted to understand the glass structure as a function of Er 3+ ions content. Our comprehensive analysis of the optical and structural properties of low Er 3+ -doped glasses provides a foundation for further exploration in the field of photonics, optical communications and plasmonics.