title: Core, shell, and surface-optimized dendrimers for blue light-emitting diodes.
abstract: We present a novel core-shell-surface multifunctional structure for dendrimers using a blue fluorescent pyrene core with triphenylene dendrons and triphenylamine surface groups. We find efficient excitation energy transfer from the triphenylene shell to the pyrene core, substantially enhancing the quantum yield in solution and the solid state (4-fold) compared to dendrimers without a core emitter, while TPA groups facilitate the hole capturing and injection ability in the device applications. With a luminance of up to 1400 cd/m(2), a saturated blue emission CIE(xy) = (0.15, 0.17) and high operational stability, these dendrimers belong to the best reported fluorescence-based blue-emitting organic molecules.
authors.affiliation: Max-Planck-Institut für Polymerforschung , D-55128 Mainz, Germany.
authors.forename: Tianshi
authors.initials: T
authors.lastname: Qin
authors.forename: Wolfgang
authors.initials: W
authors.lastname: Wiedemair
authors.forename: Sebastian
authors.initials: S
authors.lastname: Nau
authors.forename: Roman
authors.initials: R
authors.lastname: Trattnig
authors.forename: Stefan
authors.initials: S
authors.lastname: Sax
authors.forename: Stefanie
authors.initials: S
authors.lastname: Winkler
authors.forename: Antje
authors.initials: A
authors.lastname: Vollmer
authors.forename: Norbert
authors.initials: N
authors.lastname: Koch
authors.forename: Martin
authors.initials: M
authors.lastname: Baumgarten
authors.forename: Emil J W
authors.initials: EJ
authors.lastname: List
authors.forename: Klaus
authors.initials: K
authors.lastname: Müllen