Preparation and MIR Luminescence Properties of Er 3+ Doped Fluorochloride Glass

The Er 3+ doped fluorochloride glass sample was prepared by incorporating Cl - into the fluoride glass (ZBLAN) using a conventional melt quenching method. The chemical stability, thermal stability and fluorescent properties of the Er 3+ doped fluorochloride glass were reasearched by increasing the Cl - concentration. The effect of different Cl - concentrations on the luminescent properties of the fluorochloride glass was compared. The results show that the luminescent intensity of infrared increases with the increase of Cl - concentration. When the Cl - concentration reaches 15 mol%, the luminescent intensity is the strongest. At the same time, the effects of different Er 3+ concentrations on the luminescence properties of fluorochloride glass were compared. The optimum doping concentration of Er 3+ was 1 mol%. Hence, it is represented here as ZBLAN:15Cl, 1Er. The X-ray diffraction (XRD), absorption spectrum, near-infrared spectrum (NIR) and mid-infrared spectrum (MIR) of Er 3+ doped fluorochloride glass were analyzed by experiments. The energy level diagram of Er 3+ and the infrared luminescence of the sample were analyzed. The infrared luminescence of Er 3+ at the excitation of 980 nm was mainly studied. The Judd-Ofelt parameters were calculated. It was found that the value of Ω 2 increased first and then decreased to the Cl - contents increasing in the glass matrix, while Ω 4 and Ω 6 did not change obviously in different glass composition. This is because the environment of the crystal field around the rare earth ions has changed. In the Er 3+ -doped fluoride glass, the introduction to Cl - significantly enhances the mid-infrared luminescent intensity of the fluorochloride glass. The calculation of J-O theoretical parameters shows that the introduction to Cl - enhances the covalentity of the coordination bond with Er 3+ , reduces the local symmetry, and significantly enhances the luminescent intensity of fluoride glass. Rare earth ion doped fluorochloride glass provides a theoretical basis of improving luminescent properties. At the same time, it has important guiding significance of the research, development and application of similar MIR luminescent materials.