Novel electron-transport materials containing oxadiazole units:design,synthesis,and structure-property relationships

With the development of organic light-emitting diodes(OLEDs),the electron transport materials(ETMs) have attracted considerable interest.In the paper,three novel long conjugation structural 2,5-diphenyl-1,3,4-oxadiazole derivates,4a,4b and 4c were synthesized,their structure and properties were characterized and evaluated by FTIR,1HNMR,UV-vis,FL,TGA and C-V,respectively.The results show that the thermal stabilities and LUMO energy levels of the oxadiazole derivates are significantly affected by molecular structure.The extended molecular conjugation structure significantly enhances electron affinity of molecules.Enhancing p electron conjugation and polarity of molecules will be beneficial to increase of thermal properties of oxadiazole derivates.