Influence of Boron anomaly on the NIR fluorescence concentration quenching of erbium ions in borate glasses

Abstract Constructing the glass matrix to avoid the concentration quenching is significant to obtain heavily doping and higher optical gain glasses. In this work, B2O3-Na2O binary glasses with different O/B were employed for discussing the relationship between the glass structure and erbium ions concentration quenching. The Raman spectra indicated that when the O/B was 0.16, the [BO3] would be mostly transformed into [BO4] in the glass network, and furtherly increased O/B, the [BO3] would not be transformed into [BO4] continuously. The critical doping concentration was highest when the O/B was 0.16, which suggested that the relative complete framework structure would be beneficial to obtain homogenously distribution of rare earth ions. Lower O/B, more diverse of the glass structure units, which would be favor to obtain broadband width of NIR fluorescence of Er3+ ions.