Synthesis And Properties Characterization Of Novel Cyclometalated Ligand And Its Cationic Iridium(Ⅲ) Complexes

The social information technology have developed a lot, information display technology has received unprecedented attention. In the 21 st century, by the growing demand for display equipment, the traditional display has already can’t satisfy people’s growing demand, so the study of the more perfect, more advanced display has become a problem to be solved for the various countries at present.Solid-state light-emitting electrochemical cells(LECs) as a new generation of display technology with its superior performance have drawn more interest. The materials of LECs are mostly ionic transition metal complexes, using transition metal complexes as solid light-emitting electrochemical luminescence materials can greatly improve the efficiency of the device. Among several common kinds of transition metal complexes, Ir(Ⅲ)complexes is becoming the hotspot field in electroluminescence because of its relative short phosphorescence life and luminescence quantum efficiency.Among the transition metal iridium complexes, ionic iridium complexes also possess much more features such as high luminous efficiency, emission wavelength can be adjusted than neutral irdium complexes make it has the potential to be a better electroluminescent materials. Such as: first of all, compared with neutral iridium complexes, ionic iridium complexes are synthesized in a more moderate conditions with higher yield and product purification is simple; second, this kind of complexes carry the charge moved freely,there is no need to add other conductive ion,this simplifies the device structure.; third, such good oxidation- reduction reversibility can improve device stability. As a result, ionic iridium complexes have a huge potential and market prospects of light-emitting materials.So far, there are still some problems to achieve the display of full color, compared to other luminous color light-emitting materials, blue and blue-green luminescent materials are still scarce, and they are very important to realize full emission color. So in this paper, we attached electron-withdrawing substitutes onto the cyclometalated ligand and got three new ionic iridium complexes, we studied the photoluminescence properties and electrochemical properties of this three kinds of complexes,we fabricated LECs devices of good performance, finally realize the blue-shift emission of the device.The main research content of this paper is as follows:1.Our work designed and synthesized new pyrazole ligand, and then reacted with N ^ N ligands, and achieved three kinds of new complexes, complexes(1)[Ir(dmecf3ppz)2bpy]+(PF6)-,(2)[Ir(dmecf3ppz)2phen]+(PF6)-,(3)[Ir(dmecf3ppz)2tt pl]+(PF6)-respectively; including dmecf3 ppz is the 3,5-dimethyl-3-(three fluorinated methyl) phenyl pyrazole, bpy is 2,2’-bipyridine, ttpl represents 1,4,8,9-tetraquinoline phenanthrene amine, phen represents1,10-phenanthroline. All this three complexes’ characterization are characterized by many testing method.2.Of the three kinds of complexes of photoluminescence properties and electrochemical properties were studied, and explained the relationship between the photophysical properties and the structure of complexes through the quantum chemistry calculation method.3.We used the three complexes as a light-emitting layer to fabricate LEC devices respectively. Their electroluminescent performance, such as electroluminescent spectra, CIE coordinates, the life and the current density of characterizing of device, and so on, were investigated.