Design, Synthesis And Application Of High-performance Iridium Complexes With Main Group Elements Regulated

Phosphorescent iridium complexes with high quantum efficiency and long triplet lifetime, havegained popularity in the last ten years by the scientists all over the world. Due to heavy atoms withstrong effect, making the singlet exciton and triplet excitons can be captured at the same time. Thisgreatly improve the quantum efficiency of the material, and the theory of quantum efficiency canreach100%. Due to their high quantum efficiency, iridium complexes can be widely used in thefield of light and lighting and so on, at the same time because of their long triplet life, they also canbe applied in biological imaging. Evenmore long lifetime of the phosphorescent iridium complexescan avoid the interference coming from background fluorescence.Structurally, iridium complexes can be divided into Bis-Cyclometallated Iridium(III) Complexesand Tris-Cyclometallated Iridium(III) Complexes. Tris-Cyclometallated Iridium(III) Complexeshave only one type of ligand, and Bis-Cyclometallated Iridium(III) Complexes have two differentligands. The same two ligands are often called cyclometallated ligand, the other one is calledancillary ligand. Two methods to design metal iridium complexes: usually a cyclometallated ligandis modified, another is to change different auxiliary ligands.In this thesis, we mainly design the different iridium complexes through the first method, inparticular, this thesis mainly consists of two parts:1, To design and synthesis a series of ionic iridium complexes with electron-withdrawingmain-group moieties, and discuss the structure characterization and optical physics properties. Theiridium complexes which have high quantum efficiency and long triplet lifetime are very suitablefor applications in cell imaging. Finally, we achieved the application of biological imaging using theionic iridium complexes.2, To design and synthesis a series of neutral iridium complexes with electron-withdrawingmain-group moieties, and discuss the structure characterization and optical physics properties. Theiridium complexes introduced some main group elements with special function group, have the highquantum efficiency, long triplet life and good carrier transmission performance. Finally, the authorsuse the iridium complexes as the emitting material in OLED devices.