Synthesis and Properties of New Organic Electroluminescent Materials of the Distyrylarylene Derivatives Containing N-hexyl Carbazole and Phenothiazine Structures

Distyrylarylene derivative is one of the most promising blue OLED materials with good film forming ability and high thermal stability.Two compounds were synthesized by introducing the conjugated groups to the distyrylarylene backbone by using Wittig-Horner reactions.Their chemical structures were characterized by 1H NMR,IR,MS and EA analyses,and the properties were investigated by UV,PL,TGA,DSC,PLM and XRD analyses.The results showed that(1) two compounds emitted strong fluorescence,and the emitting strength of the compound with phenothiazine structure was stronger than that with carbazole structure;(2) the compounds possessed high thermal stability;(3) the compounds had good solubility in organic solvents and film forming ability,which was advantaged for OLED device fabrication using spin-coating method;(4) the compound containing phenothiazine groups exhibited a Smectic A liquid crystalline phase under hot-stage PLM.