[摘要]：A facile approach for synthesis of spirobifluorene trimers with peripheral carbazole functional groups by using Suzuki coupling as the key reaction was developed. These novel compds. exhibit blue emission with high quantum yields in soln. and thin films, and excellent spectral stability upon photoirradn. and annealing in air. By the introduction of carbazole groups, the oxidn. potentials of spirobifluorene trimers STCPC-6 and STCPC-4 were significantly lower than that of model compd. STHPH without peripheral carbazole groups, which reflect that the title compds. process higher HOMO energy level and better hole-injection ability. Highly luminescent films were obtained by electrochem. coupling between carbazole units. Pure blue-emission single-layer LEDs based on electrochem. deposition films as light emitting layers were achieved.
