Synthesis, Characterization And Application Of The Organic Molecules With AIE Effect

In recent years, organic photooptoelectronic mateials have received many domestic and foreign top scientists’ attention. The well-known aggregation induced emission(AIE) effect of organic materials has shown unique advantages. AIE effect was first found by Tang’s group in 2001. These molecules are nearly nonfluorescent in good solvent but are highly emissive in aggregation state. The abnormal fluorescent pattern is quite different with aggregation caused quenching(ACQ) effect and breaks the limitation in application, so AIE molecules become the focus of the area of organic photoelectric mateials. The theory is more and more mature with the deepening of reasearch. Restriction of intramolecular motions(RIM) is the main mechanism for the AIE effect, which includes the restriction of intramolecular rotations(RIR) and the restriction of intramolecular vibration(RIV). The areas of applications include organic light-emitting diodes(OLEDs), light-emitting liquid crystals, optical waveguides, chemical sensors, bio-sensors, bio-imaging and smart materials. Now, besides silole and TPE, many molecules with AIE effect have been found, such as aryl-substituted vinly compounds, nitrile-substituted diphenyl vinly compounds, diphenylvinly anthracene. Among these AIE-gens, silole and TPE derivatives have been widely explored due to the advantages of easy synthesis and good fluorescence properties.In this work, TPE and silole are chosen as the baisc units for new molecules designs, we synthesized and characterized a series of AIE-gens consisting of TPE or silole. Their AIE feature, chemical sensing and OLEDs performance were involved.Firstly, we shnthesized and characterized three luminogens BTPE-O5,BTPE-NO5 and TPE-NOH based on TPE core and multi- ether, amino and multi-ether in combination with amino as the functional groups. The three organic molecules showed classic AIE effect and explored the applications in calcium ion, carbon dioxide and HCl sensing.Secondly, we synthesized and characterized two luminogens p-4FS and m-4FS based on multi-fluorine substituted silole, AIE effect and special crystal properties were presented. The OLEDs showed good performances when using as the light-emitting layer, and p-4FS displayed better performances, with maximum external quantum yield and maximum current efficiency as high as 3.38% and 7.57cd/A, respectively.