Synthesis And Solid-state Luminescense Properties Of Arylfumaronitrile Derivatives

For most conventional organic luminescent materials,impressive emissive features can be obtained in their dilute solutions,while weak or completely quenched emission was observed in the solid state for the detrimental aggregation-caused quenching(ACQ).In 2001,Tang and his co-workers proposed a unique photophysical phenomenon of “aggregation-induced emission(AIE)”,and it has been considered as one of the most powerful strategy for overcoming ACQ effect.Since then,organic solid luminescent materials have attracted the attention of researchers in the fields of optoelectronic display,intelligent sensing and information encryption.The design of organic luminescent materials is mainly based on two aspects: one is to obtain efficient photoluminescent quantum yield,the second is to adjust the emission wavelength to achieve full color solid state fluorescence emission.Therefore,it is critical to develop new efficient solid fluorescent materials by exploring new skeleton units continuously and the structure-activity relationship between molecular structure and luminescence performance.Based on the above viewpoints,a series of organic fluorescent materials were designed and synthesized in this paper.The work is as follows:Chapter 1 : Three methoxy-arylfumaronitrile dimers with different substituent position were synthesized by the arylfumaronitrile.Fluorescent material showing an AIE behaviour,with the change of the substituent position,the intensity of solid-state emission has been improved greatly,the efficient photoluminescent quantum yield up to 93.1%.Meanwhile,it shows excellent mechanofluorochromic.Chapter 2:Red emission is one of the three primary colors that are essential for the realization of full-color displays and solid-state lightings.High solid-state efficiency is a crucial factor for the applications in organic light emitting diodes.Based on the content of the previous chapter,we choose arylfumaronitrile dimers as core skeleton,connect with different donor units(9,9-dimethyl acridine,carbazole,4,4’-dimethylaniline and phenoxazine),and four new D-A-D type fluorescent materials with an AIE properties were designed and synthesized.And we adjusted the emission wavelength from red to the near infrared region successfully.Chapter 3:Arylmaleimide is a kind of arylfumaronitrile derivatives,its rigid planar structure makes it have high fluorescence.In addition,due to multiple substitution sites in the aromatic ring.It has been used to construct efficient fluorescent materials.Based on this framework,we synthesized a series of triarylmaleimides by regulating their solid-state luminescence,and selected a number of highly efficient solid-state luminescence materials.