Synthesis,physical and chemical properties of carbazole derivatives possessing aggregation induced emission characteristic

Two novel carbazole derivatives(S1 and S2) were synthesized with carbazole and fluorenone as raw materials via Suzuki coupling reactions. The structures of the S1 and S2 were characterized by means of FTIR,1H NMR and elemental analysis. Their UV-Vis spectra,fluorescence spectra,electrochemical behavior and thermal stability were studied respectively. The results showed that the thin films of the S1 and S2 emited red fluorescence at 637 and 649 nm,respectively. They both had the obvious performance of aggregation induced emission(AIE). The HOMO energy levels of S1 and S2 were-5. 26 and-5. 29 e V,which matched with work function(-4. 8 e V) of positive electrode ITO,so the barrier of hole transporting could be effectively reduced and beneficial for holetransport. The results of TG curves showed that their thermal decomposition temperatures(Td) are 351 and 360℃,respectively,and they both had good thermal stability.