Design,Synthesis And Characterization Of High-performance Luminescent Materials

Organic small molecule luminescence materials have the advantages of wide selection,easy purification,strong chemical modification,easy structure adjustment and high fluorescence quantum yield,It is widely used in LED,fluorescent sensor,organic solid state laser and so on.High performance organic luminescence materials were synthesized by using2'-hydroxychalcone and pyrazole ring as the core structures,Among them,2'-hydroxychalcone is highly modifiable,and different substituents can be connected at both ends of conjugate Bridges;Secondly,conjugate effect and-OH with C=O(C=O … … H)forming intramolecular hydrogen bonds to enhance electron fluidity of the whole molecule.Pyrazole ring compounds have excellent optical properties due to the particularity of nitrogen atoms,and can produce blue,green and other colors of light in different solvents.The following is the design of2'-hydroxychalcone and pyrazole ring compounds molecular framework.This article carried out the following specific work:Aldol condensation reaction was carried out with N-ethy-l-3-carbazole carboxaldehyde using 2'-hydroxyl acetophenone and 1'-hydroxy-2'-acetyl naphthalene substituted by H,F,Cl and OCH3,In addition,aldol condensation reaction with 4 '-Fluoro-2' Hydroxyl acetophenone and benzaldehyde was carried out,six compounds with chalcone as the core structure were synthesized.It was found that the crystallinity of methoxy substituted compounds was worse than that of the other three compounds,Moreover,the H compound glows weakly or even nonglows under 365 nm ultraviolet light.In addition,the luminescent colors of Cl and F substituent compounds are orange and yellow,respectively,The results show that the substituents have a certain effect on the optical properties of the compounds.Secondly,the compounds containing four different substituents were tested by amplification spontaneous emission,All four compounds were found to have ASE properties,Moreover,the light threshold of F substituent compounds in two colors(orange and red)is particularly low,It has potential application value in the field of polychromatic organic solid-state lasers.The research on pyrazole ring mainly focuses on the synthesis method.Pyrazole derivatives cannot be formed by ?-ketone containing ortho-hydroxy diphenyl structure in acidic solvent with hydrazine,The product is a derivative of flavonoids,This is mainly due to the presence of ortho-hydroxyl groups of benzene ring,resulting in the intramolecular ring-forming reaction of?-diketones in acetic acid solvent,Instead of reacting with hydrazine hydrate to produce pyrazole target products,The ultraviolet absorption spectra and fluorescence spectra of the two compounds are affected by the polarity of the solvent.