New fluorophores with rod-, V- or star-shaped structure: Synthesis, photoluminescence and electroluminescence

A series of blue light-emitting compounds with different molecular shapes were synthesized by the Pd/Cu-catalyzed Sonogashira coupling reaction. These compounds composed of hole-transporting group (carbazole) and strong fluorescent group (pyrene), which linked through 9,9-dihexyl-2,7-fluorene ethynylene. The photoluminescent (PL) and electroluminescent (EL) behavior of these compounds was investigated.