Up-conversion Photoluminescence in a Fluorophosphate Glass Matrix Doped with Yb/Er – Effects of Doping Levels

Abstract

In this work, two series of glasses of the NaF–Al₂O₃–P₂O₅ ternary system with the Na₃Al₂(PO₄)₂F₃ nominal composition, doped with Er³⁺ (1% and 0.5%) and Yb³⁺ ions were synthesized by a standard melt-quenching method and their up-conversion photoluminescence properties were studied. The as-received amorphous materials were excited by the IR laser radiation with a wavelength of 976 nm, and their emission spectra in the visible range were measured. The optical measurements were focused on the up-conversion photoluminescence spectra in the visible range. It was found that stronger up-conversion effects were observed for the series containing 1 wt% Er₂O₃. In the case of 0.5 wt% Er₂O₃, the emission response was weaker, comparable with the background noise.

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