[Abstract] 

 We report on a new polyfluorene derivative which has nonlinear main backbone and well-defined conjugation length of three flourene units. The polymer was synthesized via Suzuki coupling reaction of 9,9′-dihexyl-2,7-fluorenediboronic acid and 2-bromofluorene connected by an alkyl ring which is perpendicular to the plane of the fluorene unit.