| Organic compounds have received widespread attention in the field of photoelectricity for the abundant source and easy modification.In recent years,organic luminescent materials have made significant research progress in the aspect of molecular synthesis,luminescence mechanism and applications.As the research moves along,the design and synthesis of new organic materials with high luminescent efficiency in solid states,as well as the exploration of the structure-activity relationship,have important academic and industrial value.In this thesis,maleimide was selected as the backbone of the organic light-emitting molecule,due to its easily tuned optic properties.Different strategies including changing the substituent,the position of the substituent,the molecular planarity,the topology structure,and the molecular packing mode were employed to design and synthesize a series of compounds with branching molecular structure.Their solid-state luminescence color,intensity and lifetime are successfully adjusted,accompanied by luminescent properties modulated from aggregation-induced quenching(ACQ),aggregation-induced emission(AIE),crystallization-induced emission(CIE),to dual-state strong emission(DSE)in both solution and solid.Compounds with excellent solid-state luminescence properties were obtained.For example,compound M2 O with red emission at 630 nm has a high quantum yield of 46%.Dibromomaleimide with a very simple molecular structure exhibites a red phosphorescence with 91 ?s of lifetime.A mild and efficient cyclization method of arylmaleimide has successfully developed.Arylmaleimid-based dendrimers display strong DSE emission.And then the structure-activity relationship of maleimide derivatives is discussed in detail with the help of theoretical calculation and X-ray single crystal diffraction.The results offer an instruction for the design of highly efficient solid-stated luminescent molecules based on maleimide units. |
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