OPTICAL PROBES OF EXCITED-STATES IN POLY(P-PHENYLENEVINYLENE)

We have studied electronic excited states in films of poly(p-phenylene vinylene) using picosecond transient and cw photomodulation, photolumi nescence, and their excitation spectra, as well as electroabsorption s pectroscopy. We have determined all the important energy levels of sin glet excitons with odd and even parity, the onset of the continuum ban d, the two-electron (biexciton) states, and the two relevant triplet s tates, and show that good agreement exists with models involving elect ron correlation.