Progress in the application of diazine compounds in optoelectronic functional materials

As a new and developing field, organic electronics is attracting much attention and has contributed greatly to progress in science and technology over the past few decades. Satisfactory results have been achieved for the use of organic optoelectronic materials in various electronic devices. As the most basic component used in electronic devices, organic optoelectronic materials have attracted an increasing amount of attention. Diazine compounds have excellent optical and electrical properties and are some of the most researched compounds in the photoelectric material field. They contain a benzene ring in which two of the C-H fragments have been replaced by isolobal nitrogen. Three isomers: pyridazine (1,2- diazine), pyrimidine (1,3-diazine), and pyrazine (1,4-diazine) exist. Because of the relative position of two of the N atoms, they can be modified in different positions and can be effectively used to control the electronic structure of the material. Therefore, they have received widespread attention. In this review, a summary of recent research progress into diazine compounds in different optoelectronic functional material application fields is provided. Specifically, photovoltaic materials, thin film semiconductor materials, liquid crystal materials, chemosensor materials, and electroluminescent materials are discussed. Finally, existing important problems and the future development of diazine compounds are also discussed.