title: ortho-, meta-, and para-dihydroindenofluorene derivatives as host materials for phosphorescent OLEDs.
abstract: This work reports the first structure-properties relationship study of ortho [2,1-c]-, meta [1,2-a]-, and para [1,2-b]dihydroindenofluorenes, highlighting the influence of bridge rigidification on the electronic properties. This study has made it possible to devise an extended π-conjugated molecule with both a high triplet state energy level and excellent thermal and morphological stability. As a proof of concept, dihydroindenofluorenes were used as the host in sky-blue phosphorescent organic light-emitting diodes (PhOLEDs) with high performance.
authors.affiliation: UMR CNRS 6226-ISCR-Université de Rennes 1, 35042 Rennes cedex (France).
authors.forename: Maxime
authors.initials: M
authors.lastname: Romain
authors.forename: Sébastien
authors.initials: S
authors.lastname: Thiery
authors.forename: Anna
authors.initials: A
authors.lastname: Shirinskaya
authors.forename: Céline
authors.initials: C
authors.lastname: Declairieux
authors.forename: Denis
authors.initials: D
authors.lastname: Tondelier
authors.forename: Bernard
authors.initials: B
authors.lastname: Geffroy
authors.forename: Olivier
authors.initials: O
authors.lastname: Jeannin
authors.forename: Joëlle
authors.initials: J
authors.lastname: Rault-Berthelot
authors.forename: Rémi
authors.initials: R
authors.lastname: Métivier
authors.forename: Cyril
authors.initials: C
authors.lastname: Poriel
keywords: LEDs; dihydroindenofluorenes; organic semiconductors