Synthesis And Properties Of Novel Organic Materials Containing Aggregation-induced Emission Effect And Aromatic Ring Substituted Phenazine Derivatives

Since the1950s, most studies have shown that the fluorescence of a number of luminophores became weaker or even completely quenched in concentrated solutions or in the solid state. This common photophysical phenomenon is widely known as’concentration quenching’or’aggregation-caused quenching’(ACQ) of light emission. The ACQ process has been studied in great detail, and mature theories have been established. The ACQ effect, however, is harmful in practice, because luminophores are usually used as solid films or aggregates in real-world applications, which hinders them from realizing their full potential. Numerous processes have been employed and many approaches have been developed to prevent the luminophores from aggregating, but these efforts have met with only limited success.The discovery of the AIE effect overturns the general belief of’concentration quenching’ or ACQ of luminescence processes, opens a new avenue for the development of new luminogen materials in the aggregate or solid state. The AIE effect permits the use of highly concentrated solutions of luminogens and their aggregates in aqueous media for sensing and imaging applications, which may lead to the development of fluorescence turn-on or light-up nanoprobes.The phenazine derivatives are very promising organic photoelectric materials with rich electrons and high redox activities. There are special characteristics in the compounds involved in this thesis, which can be used as fluorescent probe and solid emission and so forth.The main contents and results are generalized as follows:In Chapter1, the AIE phenomenon and main applications are reviewed.In Chapter2, two novel organic AIE materials based on2,3,3-triphenylacrylonitrile have been synthesized and characterised. Their optophysical properties, AIE properties and piezochromic effect have been studied. And we also detected explosive information employing these2dyes in aggregates.In Chapter3, three phenazine derivatives with big Stokes shift have been prepared and characterized. There are emissions both in solid-state and solution with different phenomenon. Their ultraviolet absorption spectrum and fluorescence spectrum have been studied, also with the exploration of AIE properties. Since there is emission in solid-state, we did a test on the PL spectrum of these powders, as well as their quantum yield. It turns out that the quantum yield of the three compounds locates at about20%.In Chapter4, it goes with conclusion.