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The photogeneration quantum efficiency action spectra of long-lived neutral and charged excitation in films of a ladder-type poly(para-phenylene) were measured. We found that both triplet and polaro action spectra show, in addition to a step function increase at the optical gap, a monotonic rise at high energies. For triplets this rise is explained by singlet exciton fission into triplet pairs from which the triplet exciton energy in the gap was obtained; this energy was also confirmed by measuring the wea phosphorescence band. For polarons the photogeneration increase at high energies is modeled b novel hot electron interchain tunneling process. [S0031-9007(99)08980-2]

Photogeneration Action Spectroscopy of Neutral and Charged Excitations in Films of a Ladder-Type Poly(Para-Phenylene)