The Near- And Mid-infrared Luminescent Property Of Tm³⁺ Doped Oxyfluorosilicate Glass With Its Enhanced Mechanism

Near-and mid-infrared glass is a key material in laser,communication,environment monitoring and so on.However,the selection of glass matrix materials,hydroxyl removal technology and luminescence enhancement methods are still full of challenges.Silicate fluoride oxide glass has the advantages of low phonon energy,good thermo-chemical stability,low cost and easy to be pulled into optical fiber,which makes it a good matrix glass material for near-and mid-infrared lasers.In this paper,The experimental content mainly focuses on the preparation and luminescence enhancement of thulium-doped silicate fluoride glass?SiO₂-PbF₂-PbO-TmF₃?.The research content mainly includes two parts:In the first part,the components of 50SiO₂-45PbF₂-?5-x?PbO-2.5TmF_3-xPb?NO₃?₂?x=0,0.2,0.4,0.6,0.8,1.0?,the aim of enhancing near-and mid-infrared luminescence was realized by removing hydroxyl groups in the matrix by nitrate ions after introducing part of lead oxide in the matrix replaced by lead nitrate.The results show that when the corresponding amount of lead oxide is replaced by a small amount of lead nitrate,the near-and mid-infrared luminescence intensity of glass is greatly enhanced.In addition,it was found through the infrared transmission spectrum that the introduction of trace lead nitrate would significantly reduce the content of hydroxyl in the matrix glass,significantly decrease the absorption coefficient of hydroxyl,and eventually lead to the significant enhancement of NIR luminescence.In addition,the gas produced by the decomposition of lead nitrate in the melting process will take away some moisture in the matrix when it is released at high temperature,thus greatly improving the luminous efficiency of rare earth ions.Finally,the enhancement mechanism of NIR luminescence is explained by calculation and J-O parameters of characteristics samples.The second part,mainly for Ag⁺from excimer enhanced and halide to hydroxy increase near infrared light-emitting are discussed in this paper,the components of50SiO₂-45PbF₂-?5-x?PbO-2.5TmF_3-xAg₂O/AgCl?According to the mole percentage of Ag⁺introduced,the value of x is calculated as 0,0.2,0.4,0.6,0.8,1.0?,respectively,the preparation of the two groups of samples of glass?the STO series and the STA series?,the emission spectrum,And the STA series enhancement effect is more significant.The enhancement mechanism of STO series near-and mid-infrared luminescence was attributed to the enhancement of Ag⁺isoexcimer.For STA series samples,FTIR analysis showed that with the increase of AgCl content,the content of hydroxyl in the glass matrix decreased significantly,and the absorption coefficient of hydroxyl decreased significantly.In other words,the medium excitor-intensification of STA series combined with the chemical method of hydroxyl removal greatly enhanced the n IR luminescence.The AgCl series samples were further subjected to annealing and crystallization treatment at different temperatures,combined with infrared fluorescence spectrum,FTIR infrared transmittance and other characterization methods,and the J-O parameters of some samples were calculated to further discuss the influence of Ag⁺surface plasma resonance?SPR?on Tm³⁺near-and mid-infrared luminescence intensity.