New Well-Defined Poly(2,7-fluorene) Derivatives: Photoluminescence and Base Doping

摘要: Well-defined poly(2,7-fluorene) derivatives have been prepared through palladium-catalyzed couplings between various 9,9-disubstituted or 9-monosubstituted 2,7-dibromofluorenes and 2,7-bis(4,4,5,5- tetramethyl-1,3,2-dioxaborolan-2-yl)-9,9-dioctylfluorene. Using this versatile synthetic method, process- able polyfluorenes obtained in good yields. In solution, all these neutral yellow polymers exhibit blue emission (maximum of around 410 nm) with high quantum yields (up to 0.87). Moreover, novel acidic polyfluorene synthesized (i.e., poly(2,7'-(alkyl 9,9-dioctyl-7,2'-bifluorene- 9'-carboxylate))s) which show, upon base doping, electrical conductivities 10-6-10-5 S/cm. This new doping method for conjugated could open the way preparation air-stable electron- injecting electrodes. Both photophysical properties are quite promising fabrication efficient blue-light-emitting devices.