The Effect of Fluorine Anions on the Luminescent Properties of Eu‐Doped Oxyfluoride Aluminosilicate Glasses

Eu‐doped oxyfluoride aluminosilicate glasses were prepared by melt‐quenching method. The glass samples were characterized by photoluminescence (PL) spectroscopy and electron paramagnetic resonance techniques. In the glass samples, the reduction of Eu 3+ to Eu 2+ ions occurred in the air condition. The PL spectra showed that the intensity of 4 f 6 5 d →4 f 7 transition of Eu 2+ ions increased and the corresponding peak wavelength decreased with increasing fluorine anion concentration. Meanwhile, the relative emission intensity ratio of Eu 2+ to Eu 3+ also depended on the content of fluorine anions. A possible reduction mechanism was discussed.