Synthesis and Spectral and Electrochemical Properties of Novel Carbazole Derivatives with Aggregation-induced Emission Feature

Two novel carbazole derivatives: 3-fluorenylidene hydrazo methylene-N-ethylcarbazole and 3,6-bis-(fluorenylidene hydrazo methylene)-N-ethylcarbazole(a and b)were synthesized by addition reaction with carbazole and fluorenone as raw materials.The structures of the two target compounds 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 show that the thin films of the two compounds(a and b) emit red fluorescence.They all obviously have the performance of Aggregation-Induced Emission(AIE).Their ionization potential energy levels(5.62 and 5.65 eV) match the work function of positive electrode ITO,implying that the hole transporting barrier can be effectively reduced to be in favor of hole-transport.The results of TG curves show that their thermal decomposition temperatures are 310 and 309℃,respectively,and they all have good thermal stability.