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Spiroconjugation-enhanced intramolecular charge-transfer state formation in a polyspirobifluorene homopolymer

King, S.M.; Hintschich, S.I.; Dai, D.; Rothe, C.; Monkman, A.P.

Authors

S.M. King

S.I. Hintschich

D. Dai

C. Rothe



Abstract

In this work we demonstrate the complex excited-state behavior of polyspirobifluorene in the solid state, which, due to the interaction of the spiroconjugated side group, readily forms a charge-transfer (CT) excited state of lower energy than the singlet exciton. The polymer is compared to standard polyfluorene materials using pump−probe and field-assisted pump−probe spectroscopy. It has been found that the small energy barrier between the singlet exciton and the CT state allows for population of the emissive singlet state at room temperature giving rise to a long tail in the singlet lifetime compared to an apparent single-exponential lifetime at low temperature. It is proposed that in devices the CT state is populated on charge recombination before the singlet states are excited by electron transfer from the CT state.

Journal Article Type Article
Publication Date Nov 1, 2007
Deposit Date Sep 29, 2010
Journal Journal of Physical Chemistry C
Print ISSN 1932-7447
Publisher American Chemical Society
Peer Reviewed Peer Reviewed
Volume 111
Issue 50
Pages 18759-18764
DOI https://doi.org/10.1021/jp0755138
Public URL https://durham-repository.worktribe.com/output/1539363