Synthesis And Properties Research Of Novel Organic Light-emittting Material Diazapyrenes And Phenanthroimidazoles

In recent years,more and more attention has been paid to the organic light-emitting materials.The organic light-emitting materials with excellent performance have been developed and applied to various electronic devices.But with the rapid development of science and technology and the progress of human society,the demand of the organic fluorescent materials with special function are more expansion,so it is great significant to develop organic light-emitting materials with special function.In this paper,seven kinds of organic small molecular light-emitting materials were synthesized and their quantum mechanics properties,spectral properties,thermodynamic properties and electrochemical properties were studied.The main work of this paper is as follows:Firstly,Five diazapyrenes compounds were synthesized and characterized,their UV-vis spectra and fluorescence emission spectra were performed,their maximum absorption wavelength were located in 363-391 nm,their maximum emission wavelength at 391-467 nm in solution,Thermogravimetric analysis results showed that they have good thermal stability and their decomposition temperature were 432 ? 420 ?,418 ?,402 ? and 409 ?.Their HOMO levels were calculated from the cyclic voltammetry curves,which were located at-5.01 eV--5.10 eV,were close to the work function of ITO anode,and showed potential as hole-transporting materials.The fluorescence quantum yields of Py4 and Py5 are 0.33,0.35 and their optical band gap is wider,which is consistent with the requirements of the blue light-emitting materials.Secondly,Two new Phenanthroimidazoles organic light-emitting materials Py6 and Py7 were designed and synthesized.The maximum absorption wavelength of compounds Py6 and Py7 in dichloromethane is at 360 nm,their maximum emission wavelength at 392-399 nm,and their fluorescence quantum yield is 0.36,which laid the foundation for blue light material.By thermogravimetric analysis experiment,the pyrolysis temperature of compounds Py6 and Py7 were 371 ? and 309 ?,the glass transition temperature was not observed in the process of heating solid powder,these results indicated that these compounds have high thermal stability and heat resistance.The HOMO level of compound Py6 and Py7 were-5.91eV?-5.74 eV and their LUMO level were-2.61 eV?-2.54 eV by the cyclic voltammetry curve,their optical band gap is 3.2-3.3 eV,which can become good blue light-emitting materials.