Design,synthesis And Photophysical Properties Of Multinuclear Cationic Iridium(?) Complexes

Organic electroluminescent materials is one of the research hotspots in world's research community.Of these materials,the iridium complexes continue to receive considerable attention due to their outstanding photophysical properties.However,the intrinsic self-quenching of luminophores caused by aggregation,namely aggregation-caused quenching(ACQ),has limitation in their practical applications.Recently,a new strategy for mitigating ACQ effect is to design multinuclear iridium complexes.For iridium complexes,the central iridium atom plays an important role in the luminescence properties.It is generally known that the spin-orbit coupling(SOC)effect caused by heavy metal atom is resonable for the phosphorescent emission of iridium complexes.The present of the additional metal centres in multinuclear iridium complexes may facilitate SOC pathways.So introduce two or more metal in one molecule is an effective method to influnce the physical properties.Therefore,to design the mutinuclear iridium complexes can not only enrich the types of iridium complexes,but also have great significance in practical applications.According to these theoretical basis,we have successfully designed and synthesized a series of multinuclear iridium complexes with excellent properties.The details are as follows:(1)We present new cationic dinuclear and trinuclear iridium(III)complexes with flexible chain functionalized triazole–pyridine moieties as bridging ligands.These complexes are applied to the explosive detection.Based on the experimental phenomenon,the quenching mechanism for the effect detection of explosive TNP are discussed in detail.(2)We have successfully synthesized dinuclear cationic iridium complexes with the same kind of bridging ligand.Based on the excellent photophysical properties of these complexes,single-layer non-doped electroluminescent devices were fabricated.