Optical and electrical properties of fluorene-based π-conjugated polymers

Electroactive and photoactive copolymers derived from fluorenes have been prepared from palladium- catalyzed Suzuki couplings. For instance, poly((4,4'-biphenylene)-2,7-(9,9-dioctylfluorene) ) and poly((2, 5-thienylene)-2,7- (9,9-dioctylfluorene)) exhibit strong emission in the blue region (406 nm, phi(n) = 0.72) and in the green region (496 nm, phi(n) = 0.49), respectively. These fluorene-based pi-conjugated polymers also show reversible electroactivity upon reduction and oxidation. The good electrical transport of both p-type and a-type charge carriers combined with excellent luminescent properties should lead to the development of efficient light-emitting devices.