“…Therefore, strong upconversion emission can be easily observed in erbiumdoped tellurite glasses at room temperature, and the mechanisms of upconversion have been analyzed in detail. However, little attention has been paid towards the temperature dependence of frequency upconversion processes involving erbium (Er) ions implanted into amorphous solids [12,13]. In this paper, temperature quenching characteristics of infrared-to-visible frequency upconversion in ytterbium (Yb) sensitized erbium-doped tellurite glasses were reported, and results were analyzed systematically by rate equations.…”