Synthesis And Properties Of Multifunctional Phosphorescent Iridium (â…¢) Complexes Materials

Organic electroluminescent devices (OLED) has a very good application prospect in thefield of flat panel display and in the solid state lighting. As the phosphorescent material cansimultaneously use singlet and triplet luminescence radiation, enabling the device within thetheoretical quantum efficiency of100%, they has received vast attentions recently. Iridiumcomplexes are currently the most widely studied as phosphorescent materials. Iridium is used asa light-emitting nuclear and the high emission efficiencies and easy tuning of emission colorscan be achieved by changing chemical structures of ligands to achieve full-color display device.Our research is based on this concept to design and synthesize iridium complexes.Coumain and their derivatives are a class of valuable compounds. They are an importantclass of orgain compounds, which exhibit not only excellent usefui phamacological activitiessuch as antibacterial, anti-HIV, anti-Pest and anticancer activity, but also have outstandingoptical properties. Optical applications, such as laser dyes, nonlinear optical chromophores,fluorescent whiteners, fluorescent probes and solar energy collectors, have been widelyinvestgated. Generally the stuctures of coumarins for luminescent materials are a donatingelectron group in7-position and electron-withdrawing groups in3-and4-position in thecoumarin ring, and then these subtituent of the position were modified reasonablly. SinceC.W.Tang etc first used3-(2-benzothiazolyl-7-diehylaminocoumarin (Coumarin6) as aeletroluminescent (EL) material successfully, coumarin derivatives have attracted muchinterests owing to their potential application in organic light-emitting diodes (OLEDs).β-diketones as a wide range of applications in many areas. With their derivative complexesas a ligand, various properties can be improved, such as the phosphorescent efficiency, thermalstability, harge transfer, etc. They have good application in photoluminescence,electroluminescence, light emitting areas of mechanical, catalysis, UV protection analysis,polymer fluorescent materials.Because of the unique electronic structure, good electrical conductivity and fluorescenceproperties, benzimidazole complexes are widely used in light-emitting materials, especiallytheir good thermal stability temperature for the development of organic light-emitting materials.Benzimidazole and their derivatives not only can be applied to an organic electroluminescentmaterial, an organic photoluminescent material and organic solar cells and other fields, but alsoare very important medicinal value to anti-cancer, anti-fungal, anti-inflammatory analgesic,anti-rheumatic, deworming and other aspects because of their good reactivity and biologicalactivity. They have always been a hot research. Carbazole can be used as intermediates fine chemicals, widely used in paints, dyes,pesticides, plastics and many other areas. Carbazole derivatives are a kind of material as a classof the hole transport in the field of organic electroluminescent.Oxadiazole and their derivatives are a class of highly fluorescent compounds, they aremainly emitted blue or violet light, which make up the status quo over. In the organic lightemitting material, generally with an oxadiazole-based compound light-emitting body surplusfilm having high performance electronic transmission can be synthesized.In the thesis, a phosphorescent iridium complex Ir(1L)bis(2L) were synthesized by usingcoumarin derivatives3-(2-pyridyl)-coumarin as the first ligand (ligand1L), withβ-dione-3-coumarin as the second ligand (ligand2L), and characterized by1H-NMR spectra;Emitting iridium metal core, some phosphorescent iridium complexes were synthesized by usedthe carrier transport group which with benzimidazolyl group, oxadiazolyl group, etc madifiedby a non-conjugated aliphatic chain as the first ligand, and the pyridin as the second ligand.They were characterized by UV-visible absorption spectroscopy, fluorescence spectroscopy,nuclear magnetic resonance spectroscopy and cyclic voltammetry. Their fluorescence emissionwas measured in a solution in dichloromethane, Ir(3L)bis(4L), Ir(3L)bis(5L), Ir(6L)bis(4L) andIr(7L)bis(4L), they contain the carrier transporting group and they are the green light emittingcomplexes.