Exciton dynamics in poly(p-pyridylvinylene).

We present results of picosecond photoinduced absorption (PA) and time-resolved photoluminescence studies on solid and soln. forms of poly(p-pyridylvinylene). The nearly identical PA response of all forms of the polymer reflects the generation of the same primary photoexcitation, a Couloumbically bound intrachain singlet exciton, and the absence of exotic species such as interchain excimers. The time dependence of the PA points to direct intersystem crossing as the origin of triplet excitons, ruling out generation of free carriers as a precursor to exciton formation. [on SciFinder(R)]