Synthesis And Properties Of Conjugated Polymers Containing Benzimidazole Iridium Complexes

Organic electroluminescent diode (OLED) will become a new generation of light-emitting vehicle owing to its self-luminous, high efficiency, wide gamut vision and thin panels, etc. Polymer phosphorus electroluminescent device, as an important part of OLED, is usually achieved through the fluorescent body doped with phosphorescent guest physically or chemically. Iridium complexes has become a most widely studied phosphorescent material resulting from its relatively short excited state lifetime, high luminous efficiency and can be covered in the visible region by varying the substituents to achieve full-color display. Type of connection using chemical bonds can effectively suppress the phenomenon of phase separation and concentration quenching, while the single white polymer electroluminescent device is acquired by complementary color overlapping of phosphorescence and fluorescence. In this thesis, the cyclometalated iridium complexes based on 2-(4-bromophenyl)-1-hydrogen-benzimidazole were suspended on the main chain of polyfluorene derivatives to form the phosphorescent polymer and three types of white polymers were obtained by adjusting the molar ratio of subject and object to regulate the incomplete energy transfer.At the same time, the synthesized monomers and polymers were characterized by elemental analysis, IR,1H NMR, 13C NMR and other analytical methods. The thermal performance, photophysical properties and electrochemical properties of all polymers were studied systematically according to TGA, UV absorption spectrum, the steady-state and transient fluorescence spectroscopy and cyclic voltammetry curves...