The Preparation And Mid Infrared Luminescent Properties Of Rare Earth Doped Halide Glass

Since fluorozirconate glass has low phonon energy,and ease of processing,fluorozirconate glass is widely studied and used for the mid-infrared materials.So,it is a acceptable choice for the infrared application,and has attracted the attention of researchers and companies in the fields of solid gain lasers,fiber gain media and other fields.In this paper,we investigated Er³⁺doped fluorozirconate glass?ZrF₄-Ba F₂-LaF₃-AlF₃-Na F?and AlF₃ based glasses.By using melt-quenching method,the glasses were present.XRD,DSC,DTA,absorption spectra,luminescence spectroscopy and Raman spectra were investigated.The relationship between the introduction of ions and luminescence properties of glasses was studied by J-O theory and Debye theory.A series of fluoro-bromozirconate glasses were prepared by melt-quenching method.The Br^-incorporation significantly enhanced the luminescence intensity of 2.7?m in fluoro-bromozirconate glass.The coefficient of OH^-groups that have a significant effect on the luminescence at 2.7?m was very small(0.74×10¹77 cm^-3).Combined with the J-O parameters,it is shown that the incorporation of Br^-increases the covalent bond around Er³⁺and reduces the local symmetry.The mid infrared luminescent intensity was enhanced by the decreasing of the phonon density.In the Er³⁺ion doped fluoro-zinc glasses,the characteristic mid-infrared luminescence spectra of Er³⁺ions in fluoro-zinc glass were investiged.The results show that with the introduction of Zn²⁺ions,the size and crystallinity change with the content of Zn²⁺ions,which affects the mid-infrared emission intensity.It was found that when the content of Zn²⁺ion reaches 2%mol%,the light emission is the highest.By J-O theory,it shows that,with the introduction of Zn²⁺,the covalency enhanced and the symmetry has declined.It is found that the fluorescence branch ratio???and lifetime???increased with the addition of Zn²⁺.A series of erbium doped fluorochloride glasses modified by different content of Cl^-were prepared by using melt-quenching method.The mid-infrared fluorescence intensity?2.7?m?has been enhanced by increasing content of Cl^-.The X-ray diffraction?XRD?,FTIR,Raman,and PL spectra were investigated.Based on Debye theory,the change of phonon density shows that the structural variety caused by increasing the content of Cl^-can enhance mid infrared luminescent intensity.By the Judd-Ofelt theory and absorption curves,it shows that parameter?₂ improved with the introduction of Cl^-,showed higher asymmetry and covalency.Emission cross-section(1.04×10^-20 cm²)and absorption cross-section(9.68×10^-21 cm²)at 2.7?m were measured.