Abstract
The study of a new composition of fluoride glasses based on a mixed fluoroaluminate matrix with small additives of phosphates was carried out. Advanced thermal stability ΔT of the initial glassy matrix, exceeding the classical fluoride systems, was established from the difference between the glass transition temperatures and the onset of crystallization (ΔT = 108 °C). Refractive index dispersion was obtained based on the Sellmeier equations. The radiative characteristics of fluoroaluminate glass samples with different erbium contents were studied in order to evaluate the efficiency of luminescence in the visible and near IR regions. It was found that the theoretical and experimental values of the luminescence lifetimes of energy levels 2H11/2, 4S3/2, 4F9/2 and 4I13/2 depend on the concentration of erbium ions. The effect of concentration quenching of upconversion luminescence bands was found; for near infrared emission around 1.5 μm the quantum efficiency was 96 % in the absence of luminescence quenching.
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