Synthesis And Properties Of Luminescent Benzoperimidine Derivatives With Multiple Electron Donating Substituents

In recent years,with the increasing of display terminal application in people’s daily work and life,organic luminescent materials and devices have attracted much attention.Currently,various types of organic luminescent materials have been continuously developed and successfully applied to various electronic and display devices.However,the requirements for organic luminescent materials with excellent performance and special functions are getting highest because of the pursuit of high-quality multi-purpose electronic and display devices.Therefore,it is necessary to create new organic small molecule luminescence materials with excellent performance and special functions.In this thesis,eight organic small molecule luminescent compounds(B1-B8)have been designed and synthesized.The spectral,thermodynamic and electrochemical properties of the compounds have been studied.All the specific studies are outline as follows:Eight benzoperimidine compounds(B1-B8)have been synthesized and characterized in this thesis,the UV-Vis spectrum and fluorescence emission spectra of the compounds in different solvents have been studied in detail.The experimental results show that the maximum absorption wavelengths of the compounds in dichloromethane solution are in the range of 360-390 nm,and the maximum fluorescence emission wavelengths are in the range of 412-502 nm.The polarity of the solvent has a certain influence on the absorption and emission of the compounds.In addition,the fluorescence quantum yields of the compounds(B1-B8)in dichloromethane solution are calculated.The rates were 0.38,0,27,0.31,0.21,0.32,0.28,0.32,and 0.48,respectively.Thermogravimetric analysis show that the decomposition temperatures of compounds(B1-B8)are 401 oC,371 oC,405 oC,410 ℃,407 ℃,377 ℃,398 ℃ and 396 ℃,indicating that they have good thermal stability.The compounds’(B1-B8)HOMO values are between-5.03 and-5.16 e V by cyclic voltammogram calculating.The LUMO level values are between-2.11 and-2.31 e V,which are close to the functional function of the standard ITO anode.The compounds have a wide bandgap energy level and are good luminescent materials.