An Efficient Blue-Emitting Conjugated Copolymer Based on Fluorene and Carbazole with a Peripheral Dendritic Carbazole Pendant at the 9-Position

A new fluorene-co-carbazole-based copolymer (PFCD), with a bulky peripheral dendritic carbazole pendant at the 9-position, has been designed and synthesized through a Suzuki polycondensation reaction. The resulting copolymer exhibits desirable properties, such as excellent solubility, good thermal stability, and electrochemical properties. PFCD also shows efficient blue light-emitting properties with excellent color purity and high photoluminescent quantum yield. The results of the photo-physical properties indicate that the large side dendron with peripheral carbazole groups can not only efficiently suppress the π-stacking of polymer chains but also raise the HOMO level of the resulting polymer material. Thus, PFCD is expected to be a promising pure blue light-emitting material and further experiments on electroluminescent properties, film morphology, and aggregation behaviors are in progress.