Synthesis And Properties Of Iridium Complexes Based On Benzothiazole Ligand And Their Main-chain Polymers

Organic/Polymer electroluminescent device (OLED or PLED) will become the new luminescence carrier in the field of flat panel display and solid-state lighting owing to its self-luminescence, wide gamut vision, high efficiency and light-color adjustable, etc. The cyclometalated iridium complex has been paid attention widely with its relatively short excited-state lifetime, high luminous efficiency and can be covered in the visible region by varying the substituent to achieve full-color display. The polymer electro-phosphorescent devices based on cyclometalated iridium complex typically employ chemical bond type connection to attach the iridium complex to the polymer chain, effectively suppressing the phenomenon of concentration quenching, phase separation and poor stability at high current density. In addition, the heavy metal iridium complex is frequently used to design the phosphorescent chemical sensor because of its large Stokes shift, high sensitivity and hard background interference. In this thesis, the cyclometalated iridium complex based on 2-(4-bromophenyl)-benzothiazole was introduced in the main chain of polyfluorene derivatives to form the phosphorescent polymers which were applied to organic electroluminescent devices. Then, introduced in various functional groups, the cyclometalated iridium complexes based on 2-(4-bromophenyl)-benzothiazole were synthesized to be phosphorescent chemical sensors.The synthesized complexes and polymers were characterized by IR,1H NMR,13C NMR, mass spectrometry and other analytical tools. The photoluminescent properties of iridium complexes and polymers were investigated systematically. The polymer electroluminescent properties were researched after the devices were fabricated by spin coating and vapor deposition. The selectivity and detection limitation of chemical sensors were also studied through photophysical performance test.