Research On Highly Polarized Fluorescent Materials Based On Metal-Organic Framework Nano Structure

With the development of the information age,optical communication networks need to provide higher-speed and larger-capacity transmission systems.Using the polarization of light to realize the polarization multiplexing system is a new technology and main development direction that meets the transmission needs and optical information processing capabilities of future optical network systems.Organic polarized light-emitting materials have the advantages of polarized light emission and short light-emitting life.It is an excellent polarization light source material that can provide a high transmission rate for polarization multiplexing optical communication systems.The polarized light-emitting characteristics of organic polarized light-emitting materials essentially lie in the orientation of organic light-emitting molecules inside the material.The higher the degree of orientation,the higher the light-emitting polarization ratio of the material.Using Metal-Organic Frameworks(MOF)materials as the host and dye molecules as guest molecules,organic polarized light-emitting materials MOF(?)guest can be prepared.The material can use the ordered pores of MOF to restrict the movement of guest molecules,which is expected to improve the orientation of guest molecules,which is a new idea for realizing organic polarized light-emitting materials.In this paper,combining theory and experiment,a series of different MOF(?)guest materials are designed and synthesized,and the guest-based luminescence polarization characteristics of these MOF(?)guest materials are studied,and the factors affecting the orientation of guest molecules are analyzed.In addition,the two primary color dyes are introduced into the main frame of MOF to obtain the white light polarized material,and the polarized luminescence characteristics of the white light material are studied and analyzed.In this paper,two MOF frameworks with different pore diameters were first synthesized,and Rhodamine B(RhB)molecules were introduced into the isomeric MOF by activated adsorption and in-situ synthesis respectively,four MOF(?)RhB materials were obtained.The fluorescence microscope observed that the four materials all emitted bright yellow light,indicating that RhB entered the MOF channel well,and MOF avoid its own fluorescence quenching.Moreover,the powder X-ray diffraction pattern shows that the guest RhB molecules have no effect on the structure of these MOF crystals.Furthermore,by measuring the fluorescence polarization spectra of four heterogeneous MOF(?)RhB crystals,it is found that as the aperture of MOF increases,the fluorescence polarization ratio of MOF(?)RhB decreases.In addition,the spectrum of MOF(?)RhB prepared by the activation adsorption method has a red shift phenomenon,which is believed to be caused by the aggregation behavior of RhB molecules in MOF.The results of this study provide a basis for the selection of materials and synthesis methods for MOF crystals with high fluorescence polarization performance.Then,the blue and yellow two basic color MOF(?)dye was prepared.On the basis of proving that both have polarized luminescence characteristics,the yellow dye RhB and the blue dye fluorescent whitening agent(KSN)were introduced into the same MOF channel by introducing guest dye molecules in stages,and the white light single crystal material MOF(?)Dye was obtained by adjusting the concentration of yellow dye.By analyzing the fluorescence polarization spectrum of white light materials,it is found that the white light materials have certain polarization characteristics.However,due to the slightly different arrangement of the two guest molecules,the white light polarization direction is not strictly along the direction of MOF channel.These research results provide an effective scheme and experimental guidance for the design and preparation of organic polarized light-emitting materials MOF(?)guest.