Abstract
New copolyfluorenes (PSiC8OF0∼PSiC8OF50) composed of 9,9-dioctylfluorene, jacketed units 2,5-bis[(5-octyloxy-phenyl)-1,3,4- oxadiazole]-1-(3,5-dibromophenyl)-benzene (35C8) and 2,5-bis(trimethylsilyl)benzene were synthesized by palladium-catalyzed Suzuki coupling reaction. They were characterized by GPC, 1H NMR, elemental analysis, DSC, TGA, absorption and emission spectroscopy, and cyclic voltammetry (CV). These copolymers were readily soluble in common organic solvents and exhibited high glass transition temperature (up to 173 °C). The copolymer films showed absorption peaks from 325 to 337 nm, and PL peaks from 402 to 408 nm with a great blue shift relative to polyfluorene (377 and 432 nm) originated from silyl and jacketed units. The transient PL spectra show a rapid rise in the lifetime, implying a sharp increase in molecular rigidity and an additional long decay time around 5∼6 ns, assigned to an “excimer-like” state, and its contribution increases with the increased jacketed fraction. The HOMO ener...
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