Research And Application Of Mid-infrared Luminescence Properties Of Rare Earth Lead-free Double Perovskite Fluoride Glass

Fluoride glass has been widely used as a medium for mid-infrared gain due to its relatively low phonon energy,high solubility of rare earth ions,low refractive index,and wide transmission window.Microcrystalline glass not only has a performance similar to that of crystals,but it also has the advantages of inorganic glass,such as high chemical stability,hydrolysis resistance,photothermal stability,and so on.The rare earth perovskite material is embedded in the fluoride glass matrix to form rare earth perovskite fluoride glass.The problems of small absorption cross section and low luminescence efficiency of rare earth ion materials can be effectively solved by using the characteristics of large absorption cross section and high luminescence efficiency of perovskite.The dense glass structure can protect perovskite and improve its stability.Cs₂AgInCl₆is an environmentally friendly,lead-free double perovskite material.The direct band gap transition makes it suitable for luminescent applications.In this paper,Er³⁺,Tm³⁺,and Dy³⁺/Tm³⁺doped Cs₂AgInCl₆zirconium fluoride glass materials are studied,and glass samples of different components are prepared by the melting quenching method.The mid-infrared luminescence properties of the samples are studied and discussed by means of EDS,Mapping,XRD,XPS,TEM,absorption spectra,PL spectra,infrared thermal spectra,Raman spectra,Fourier transform spectra,and the J-O theory,Fuchtbauer-Ladenburg theory,and Mc Cumber theory.In this paper,Cs₂AgIn_1-xEr_xCl₆-ZBLAN（ZrF₄-BaF₂-LaF₃-AlF₃-NaF）perovskite fluoride glasses are prepared.The visible light under the excitation of a 365 nm laser andthe 1.5μm and 2.7μm infrared light under the excitation of a 980 nm laser are studied.Er³⁺replaces part of In³⁺,which increases the local field asymmetry around Er³⁺.The transition of Er³⁺is enhanced.The addition of Cs₂AgInCl₆reduces the phonon energy of ZBLAN glass,so the probability of multi-phonon radiation is weakened and the mid-infrared emission is enhanced.The thick amorphous structure of the glass effectively improves the photothermal stability of the perovskite.The concentration of carbon dioxide gas in hydrogen energy is detected by using the prepared samples.In this paper,Cs₂AgIn_1-xTm_xCl₆-ZBLAY（ZrF₄-BaF₂-LaF₃-AlF₃-YF）perovskite fluoride glasses are prepared.The visible light under the excitation of a 365 nm laser and the 1.47μm,1.9μm,2.35μm and 3.46μm infrared light under the excitation of a793 nm laser are studied.Tm³⁺replaces part of In³⁺,which increases the local field asymmetry around Tm³⁺.The transition of Tm³⁺is enhanced,as is the luminescence.Cs₂AgInCl₆is embedded into the ZBLAY glass matrix,which reduces the phonon energy of the glass matrix.Therefore,the probability of multi-phonon radiation is weakened,and the mid-infrared emission is enhanced.The glass matrix effectively improves the photothermal stability of perovskite.The concentration of hydrogen chloride gas is monitored using the prepared sample.In this paper,Cs₂AgIn_1-x-yDy_xTm_yCl₆-ZBLAY perovskite fluoride glasses are prepared.The visible light performance under the excitation of a 365 nm laser and the infrared light performance under the excitation of a 793 nm laser are studied.Tm³⁺sensitizes Dy³⁺,improves the absorption efficiency of Dy³⁺in the 793 nm band,and the energy transfer from Tm³⁺:³H₄and ³F₄levels to Dy³⁺:⁶F_5/2and ⁶H_11/2levels improves the luminous intensity at 2.88μm.The addition of Cs₂AgInCl₆increases the asymmetry of the local field around Dy³⁺and reduces the phonon energy of the glass,thus further enhancing the mid-infrared luminescence.The concentration of carbon dioxide gas in hydrogen energy is detected by using the prepared samples.