Preparation And Properties Of Rare Earth Ion-doped Luminescent Glass

Due to the complex energy state and unfilled 4f energy level of rare earth ions,rare earth ion-doped luminescent glass currently has important application prospects in color televisions,solar cells,mid-infrared lasers,sensors and other fields.It is important to explore and study glass with good optical properties and practical value to adapt to the development of science and technology society.This topic uses the melt-quenching method to prepare rare earth luminescent glass using tellurite with low phonon energy and high thermal stability silicate as matrix.With the methods of co-doped and tri-doped of rare earth and metal ions,the tunable light emission of doped rare earth glass is realized through the energy transfer process between rare earth ions or between rare earth ions and bismuth ions,which has potential application prospects in the field of fiber amplification and mid-infrared lasers.The specific content of the study includes three aspects as follows:1.Er³⁺/Bi³⁺co-doped tellurite glass for mid-infrared laser applications.TeO₂-WO₃-Zn O-Na O-based glass was prepared by the traditional melt quenching method.The single-doped Er³⁺and Er³⁺/Bi³⁺co-doped tellurite glasses were prepared,and the near-infrared and mid-infrared fluorescence emission characteristics of the samples were analyzed.As a result,it was found that an optimal 2.7?m can be obtained when the concentration of doped Bi³⁺is 2 mol%.The fluorescence emission is 17.8%higher than that of the single-doped Er³⁺.This shows that Bi³⁺ion is a suitable sensitizer to enhance the fluorescence emission of 1.5?m and 2.7?m of Er³⁺ion,which indicates that Er³⁺/Bi³⁺co-doped tellurite glass has potential value that can be applied to mid-infrared laser.2.Er³⁺/Ho³⁺co-doped oxyfluorate glass for mid-infrared laser applications.The traditional melt quenching method is used to prepare glass with SiO₂-Al₂O₃-Na₂O-Ba F₂-YF₃ as the matrix.After secondary annealing at high temperature,glass containing YF₃crystals can be synthesized.The thermal stability of the precursor samples was investigated using a differential scanning calorimeter?DSC?.X-ray diffractometer?XRD?and Fourier transform infrared spectrometer?FTIR?were used to characterize the glass structure.With the increase of Li⁺ion concentration,YF₃ grains gradually grow and the field strength increases.In addition,the up-conversion and mid-infrared fluorescence emission were significantly improved,and the intensity of 2.0?m was higher than 2.7?m.When the Li⁺ion concentration is 11%,the maximum fluorescence intensity is 2.0?m,and when the Li⁺ion concentration is 7%,the maximum fluorescence intensity is 2.7?m,which indicates that there is an energy transfer process between Er³⁺ions and Ho³⁺ions.These series of results indicate that Er³⁺/Ho³⁺co-doped silicate glass doped with Li⁺ions have potential value for application in mid-infrared lasers.3.Tm³⁺/Bi³⁺/Er³⁺tri-doped fluorotellurate glass for near-infrared lasers and fiber amplifiers.Te₂O₃-Ba O-Ba F₂-La₂O₃ was used as the matrix to prepare the glass by the traditional melt quenching method.The fluorotellurate glass doped with Tm,Er and Bi was studied.Ultra-wideband fluorescence emission?950-1670 nm?was observed with a full width at half maximum?FWHM?of 610 nm,covering the O,E,S,C,L,and U bands.Compared with Tm³⁺-doped in glass,the Tm³⁺/Er³⁺co-doped and Tm³⁺/Er³⁺/Bi³⁺triple-doped 1.8?m fluorescence intensity is enhanced,indicating the energy transfer between Tm,Er and Bi.In a three-doped sample,the optimal concentration of Bi for 3?m fluorescence emission is 3mol%.The maximum fluorescence lifetime is 7.39ms,indicating excellent fluorescence performance at 1.8?m.In addition,the calculated absorption cross section(5.45×10^-21cm^-2)and emission cross section(6.89×10^-21cm^-2)indicate that the glass has good light absorption performance.The measured parameter?T?116°C?indicates that the sample has good thermal stability.These indicate that the prepared glass has a good application prospect in the field of fiber amplifier and near-infrared laser.