title: Spirobifluorene Regioisomerism: A Structure-Property Relationship Study.
abstract: The present works report the first structure-property relationship study of a key class of organic semiconductors, that is, the four spirobifluorene positional isomers possessing a para-, meta- or ortho-linkage. The remarkable and surprising impact of the ring bridging and of the linkages on the electronic properties of the regioisomers has been particularly highlighted and rationalised. The impact of the ring bridging on the photophysical properties has been stressed with notably the different influence of the linkages and the bridge on the singlet and triplet excited states. The first member of a new family of spirobifluorenes substituted in the 1-position, which presents better performance in blue phosphorescent OLEDs than those of its regioisomers, is reported. These features highlight not only the great potential of 1-substituted spirobifluorenes, but also the remarkable impact of regioisomerism on electronic properties.
authors.affiliation: UMR CNRS 6226-, Université Rennes 1, 35042, Rennes, France.
authors.forename: Lambert
authors.initials: L
authors.lastname: Sicard
authors.affiliation: UMR CNRS 6226-, Université Rennes 1, 35042, Rennes, France.
authors.forename: Cassandre
authors.initials: C
authors.lastname: Quinton
authors.affiliation: UMR CNRS 6226-, Université Rennes 1, 35042, Rennes, France.
authors.forename: Jean-David
authors.initials: JD
authors.lastname: Peltier
authors.affiliation: LPICM, CNRS, Ecole Polytechnique, Université Paris Saclay, 91128, Palaiseau, France.
authors.forename: Denis
authors.initials: D
authors.lastname: Tondelier
authors.affiliation: LPICM, CNRS, Ecole Polytechnique, Université Paris Saclay, 91128, Palaiseau, France.|LICSEN, NIMBE, CEA, CNRS, Université Paris-Saclay, CEA Saclay, 91191, Gif-sur-Yvette Cedex, France.
authors.forename: Bernard
authors.initials: B
authors.lastname: Geffroy
authors.affiliation: LPICM, CNRS, Ecole Polytechnique, Université Paris Saclay, 91128, Palaiseau, France.
authors.forename: Urelle
authors.initials: U
authors.lastname: Biapo
authors.affiliation: UMR CNRS 8531-PPSM, ENS Cachan, 94235, Cachan, France.
authors.forename: Rémi
authors.initials: R
authors.lastname: Métivier
authors.affiliation: UMR CNRS 6226-, Université Rennes 1, 35042, Rennes, France.
authors.forename: Olivier
authors.initials: O
authors.lastname: Jeannin
authors.affiliation: UMR CNRS 6226-, Université Rennes 1, 35042, Rennes, France.
authors.forename: Joëlle
authors.initials: J
authors.lastname: Rault-Berthelot
authors.affiliation: UMR CNRS 6226-, Université Rennes 1, 35042, Rennes, France.
authors.forename: Cyril
authors.identifier: http://orcid.org/0000-0002-6036-1778
authors.initials: C
authors.lastname: Poriel
keywords: organic light-emitting diodes; phosphorescence; regioisomerism; ring bridging; spirobifluorene; π-conjugation