title: Triplet energies of pi-conjugated polymers.
abstract: Using pulse radiolysis and triplet energy transfer has enabled us to measure the triplet energies in a broad range of different pi-conjugated polymers. In all cases we find that the 1 (3)B(u) is of order 0.6 to 1 eV below the 1 (1)B(u), indicative of localized triplet states with strong electron-electron correlation. We also observe that the 1 (1)A(g)-1 (3)B(u) gap decreases linearly as the 1 (1)A(g)-1 (1)B(u) gap decreases even though polymers with very different structure have been studied. This surprising result suggests that polymers with singlet gap <1.3 eV will have a triplet ground state.
authors.affiliation: Department of Physics, University of Durham, Durham, United Kingdom.
authors.forename: A P
authors.initials: AP
authors.lastname: Monkman
authors.forename: H D
authors.initials: HD
authors.lastname: Burrows
authors.forename: L J
authors.initials: LJ
authors.lastname: Hartwell
authors.forename: L E
authors.initials: LE
authors.lastname: Horsburgh
authors.forename: I
authors.initials: I
authors.lastname: Hamblett
authors.forename: S
authors.initials: S
authors.lastname: Navaratnam