Synthesis,characterization And Photoelectric Properties Of Alternating Conjugated Polymers With Different Position And Cyano Substitution Based On Spirofluoreneoxanthene

Organic electroluminescent devices have made great progress in the past few decades and have become the research hotspot of new displays and general illumination.In recent years,novel hole transporting materials such as carbazole derivatives,arylamines and spiro-linked amines have achieved remarkable improvements in high thermal stability and high hole mobility.The balance of high performance and low cost is the constant pursuit of large-scale production of large-area displays in the future.Therefore,research should be further expanded to new components to address these challenges.Recently,conjugated materials based on spiro-annulated structures have attracted extensive attention to blue light-emitting materials and charge-transporting materials due to their spectral stability,thermal stability and morphological stability.Among them,due to the great improvement of the synthetic method,the application of the spiroflureneoxanthene(SFX)moiety is increasingly appeared as a blue light-emitting material in small molecules and polymers.This paper briefly describes the basic principles of polymer electroluminescence and commonly used polymer luminescent materials.The research progress of SFX and fluorene was discussed particularly.Furthermore,some pure organic conjugated polymer luminescent materials based on(SFX)were prepared,and their photoelectric properties were investigated in detail using a variety of characterization methods.The details are as follows:1.Using 2,7-dibromofluorenone and fluorenone as raw materials,the SFX monomers with different substituted position were prepared and further were prepared into SFX aldehyde group at different substituted position.Using fluorene as raw materials,2,7-di(triphenylphosphinomethyl bromide)-9,9-dioCtylfluorene was prepared in multiple steps.Moreover,alternating conjugated polymer P1,P3 and P5 with alkoxy benzene and SFX were prepared through Wittig reaction.The data shows that polymers P1,P3 and P5 have good thermal stability,spectral stability and solubility.Device data indicates that the prepared polymers P1,P3 and P5 are blue polymer luminescent materials.2.The fluorene was used as raw material to synthesize 2,7-diacetonitrile-9,9-dioCtyl-9H-fluorene in multiple steps.Moreover,cyano-substituted conjugated polymers P2,P4 and P6 with alkoxy benzene and SFX were prepared through Knoevenagel reaction.The data shows that polymers P2,P4 and P6 have good thermal stability,spectral stability and solubility.Device data indicates that the prepared polymers P2,P4 and P6 are yellow polymer luminescent materials.3.The 2,7-dicyanospiroxanthene-3',6'-diformaldehyde monomer was prepared in multiple steps by using 2,7-dibromofluorenone.Using fluorene as raw materials,2,7-di(triphenylphosphinomethyl bromide)-9,9-dioCtylfluorene was synthesized in multiple steps.Moreover,2,7-dicyanospiroxanthene alternating conjugated polymer P7 was prepared through Wittig reaction.The data shows that the polymers P7 have good thermal stability,spectral stability and solubility.Device data indicates that the prepared polymer P7 is a blue polymer luminescent material.