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The effect of chloride ions on the properties of Er3+-doped fluorozirconate glass is systematically studied. We first observed a nonlinear mutation of the glass-forming abilities and fluorescence properties of glass when 1 mol% fluoride ions were replaced by chloride ions. The results differed from previous reports. In order to explain this special phenomenon, we investigated the changes of the structure and the Judd-Ofelt theory of glass before and after halogen anion substitution. The results indicate that part of the fluorozirconium octahedral network was destroyed and transformed into a chain structure due to the bridging chlorine atoms, of which the electronegativity is lower than F-. With the increase of Cl-, the glass-forming abilities gradually recovered due to the decrease of the liquid's temperature. Therefore, a non-linear mutation of the glass-forming abilities was exhibited. Furthermore, the predictor χ, the ratio between the Judd–Ofelt parameters Ω 4 and Ω 6 , and the reduction in phonon density caused a mutation on the fluorescence properties of glass, such as the intensity and lifetime. This research could provide a new reference for the anion modification of fluoride glass.

An Er 3+ -doped oxyfluorogallate glass is investigated as a laser material with 2.7 µm emission. The 2.7 µm emission properties of the Er 3+ -doped oxyfluorogallate glasses are obtained using a 980 nm laser diode and their spontaneous transition probabilities and branching ratios are predicted using Judd–Ofelt theory. The maximum value of emission cross-section of Er 3+ around 2.7 µm reached 1.32×10 −20 cm 2 , which suggests a very promising application of oxyfluorogallate glass for efficient 2.7 µm solid-state laser system.

A Ce:YAG transparent glass ceramic was prepared by liquid-phase sintering of a mixture of YAG-Al2O3-PbO-PbF2-B2O3 precursor glass with Ce:YAG nanocrystals. The microstructure, luminescence spectra and lifetime behaviors of the sample was investigated. The size of the YAG crystals inside the GC reached ∼20 µm. The average in-line transmittance (2-mm thick) of the GC was more than 56% in the visible region. The GC exhibited a broad yellow emission band, long lifetime (τ = 1.69 µs), good transparency, and low sintering temperature, implying that the composite is a promising candidate for high-power white light emitting diodes (WLEDs).

A germanate-tellurite glass (GeO2-TeO₂-K₂O-Nb₂O₅-La₂O₃) with thulium doping has been investigated for application as a laser material around 2.0 μm regions. Under the 808 nm laser diode pumped, intense 1.8 μm emission is obtained. Based on the absorption spectra, radiative properties are predicted using Judd-Ofelt theory. The maximum value of emission cross-section of Tm(3+) around 1.8 μm can reach 1.46 × 10(-20) cm(2), which indicated that the germanate-tellurite glass may provide high gain as a good medium for efficient 1.8 μm laser system.