Preparation And Nonlinear Optical Limiting Performances Of Low-dimensional Nano-material Composite Gel Glass

Low-dimensional nanomaterials have excellent nonlinear optical effects,high damage threshold,ultra-fast response time,large modulation depth and low cost.They have potential application prospects in optoelectronic devices such as lasers,optical modulators,and laser protection.In order to deeply explore the effect of solid-phase low-dimensional nanomaterials on the performance of optical limiting（OL）,this paper aims at the current low-dimensional nanomaterials that are unstable and easy to aggregate in the liquid phase mechanism.Through process optimization,Ligand-assisted reprecipitation method and lithium ion intercalation technology were used to prepare all-inorganic perovskite quantum dots（CsPb X₃@SiO₂QDs,X=Cl,Br,I）and layered molybdenum disulfide nanosheets（MoS₂NSs）two Low-dimensional nanomaterials.It is doped into composite gel glass using sol-gel technology,using transmission electron microscopy（TEM）,X-ray powder diffraction（XRD）,Fourier infrared analysis（FT-IR）,ultraviolet-visible absorption spectroscopy（UV-Vis）,fluorescence emission spectroscopy（PL）,and Z-scan based on nanosecond laser light source and picosecond laser light source,systematically in-depth study of synthetic preparation process and parameters,components and other materials The influence law of microstructure,luminescence performance and OL performance,the results showed that:1.A series of uniform and monodispersed spherical CsPb X₃@SiO₂QDs were prepared by the coordination-assisted reprecipitation method.The emission wavelength can be adjusted from407 nm to 650 nm,covering the entire visible light range.Z-scan results show that the performance of CsPb X₃@SiO₂QDs OL can be adjusted according to the halide ion ratio.In particular,the OL threshold of CsPbBr₃@SiO₂QDs in nanoseconds is 1.68 J/cm²,and the OL performance is significantly better than other quantum dots.2.Using lithium ion intercalation technology to peel off the two-dimensional layered MoS₂.Z-scan results show that the OL performance of MoS₂NSs increases with the increase of laser energy,with energy-related transition from saturated absorption to anti-saturated absorption.3.CsPbBr₃@SiO₂/SiO₂gel glass with uniform composition was prepared by improving the sol-gel process parameters.CsPbBr₃QDs does not affect the intermolecular interaction of the SiO₂gel glass matrix itself.The material has high environmental stability and can maintain excellent OL performance after exposure to air for 1 year.The OL performance can be optimized by adjusting the CsPbBr₃QDs component in the SiO₂matrix,and the obtained CsPbBr₃@SiO₂/SiO₂gel glass has potential applications in laser protection devices.4.The MoS₂/SiO₂gel glass was successfully prepared.Through the optimization of the preparation process,a transparent,stable MoS₂/PbO-SiO₂gel glass with excellent OL response was obtained.The heavy lead atoms enhanced the third-order nonlinear polarizability.The OL threshold of the MoS₂/PbO-SiO₂gel glass was 12.4 times that of the MoS₂suspension and 3.9times of the MoS₂/SiO₂gel glass.It is a candidate for applications in optical switches and optical confinement devices.These excellent properties show that SiO₂gel glass and PbO-SiO₂gel glass can become effective solid-phased matrix materials,which will greatly promote the practical application of low-dimensional nano-material composite gel glass in the field of nonlinear optics.