Photogeneration action spectroscopy of neutral and charged excitations in films of a ladder-type poly(para-phenylene)

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Date

1999-04-19

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Publisher

American Physical Society

Abstract

The photogeneration quantum efficiency action spectra of long-lived neutral and charged excitations in films of a ladder-type poly(para-phenylene) were measured. We found that both tripler and polaron action spectra show, in addition to a step function increase at the optical gap, a monotonic rise at higher 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 weak phosphorescence band. For polarons the photogeneration increase at high energies is modeled by a novel hot electron interchain tunneling process. [S0031-9007(99)08980-2].

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Keywords

pi-conjugated polymers, optical spectroscopy, electronic states, electroluminescence, excitons, Physics

Citation

Wohlgenannt, M ; Graupner, W ; Leising, G ; et al., Apr 19, 1999. “Photogeneration action spectroscopy of neutral and charged excitations in films of a ladder-type poly(para-phenylene),” PHYSICAL REVIEW LETTERS 82(16): 3344-3347. DOI: 10.1103/PhysRevLett.82.3344