Abstract
The Er3+ 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 Er3+ 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 Er3+ concentrations on the luminescence properties of fluorochloride glass were compared. The optimum doping concentration of Er3+ 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 Er3+ doped fluorochloride glass were analyzed by experiments. The energy level diagram of Er3+ and the infrared luminescence of the sample were analyzed. The infrared luminescence of Er3+ at the excitation of 980 nm was mainly studied. The Judd-Ofelt parameters were calculated. It was found that the value of Ω2 increased first and then decreased to the Cl- contents increasing in the glass matrix, while Ω4 and Ω6 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 Er3+-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 Er3+, 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.
Highlights
Most mid-infrared (2~3μm) materials have a basic vibration absorption band that can produce a discontinuous half-width [1]
All samples exhibited typical broad diffraction peaks of vitreous at 26°and 47°. This indicates that the fluorochloride glass samples are all in an amorphous glass state, which is consistent with the results reported in most papers [26]
Fluorochloride glass was prepared for introducing Cl- into an Er3+ doped fluoride glass by a conventional melt quenching method
Summary
Most mid-infrared (2~3μm) materials have a basic vibration absorption band that can produce a discontinuous half-width [1]. Rare earth ions have different coordination fields in different glass matrices, such as fluorides, sulfates, phosphates and silicates. Jiajia Zhang et al.: Preparation and MIR Luminescence Properties of Er3+ Doped Fluorochloride Glass. The probability of multi-phonon relaxation of rare earth ions increases, and the probability of mid-infrared emission decreases. As2S3 glass as one of the chalcogenide glass has good thermal stability and glass forming ability, and has high transmittance in the infrared region It has a low glass transition temperature (200°C), high toxicity, and poor rare earth solubility. Ga-La-S (GLS) is non-toxic, high solubility of rare earth ions, high glass transition temperature, but low thermal stability of GLS glass, and the difference between the conversion and devitrification temperature is only 40°C, which poses a problem for fiber preparation [18]. X-ray diffraction, absorption spectrum, near-infrared spectrum and midinfrared spectrum were analyzed
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