title: Core-and-surface-functionalized polyphenylene dendrimers for solution-processed, pure-blue light-emitting diodes through surface-to-core energy transfer.
abstract: Several pyrene-based polyphenylene dendrimers (PYPPDs) with different peripheral chromophores (PCs) are synthesized and characterized. Deep blue emissions solely from the core are observed for all of them in photoluminescence spectra due to good steric shielding of the core and highly efficient surface-to-core Förster resonant energy transfers (FRETs). Device performances are found in good correlation with the energy gaps between the work function of the electrodes and the frontier molecular orbital (FMO) levels of the PCs. Pure blue emission, luminance as high as 3700 cd m(-2) with Commission Internationale de l'Éclairage 1931 (CIE(xy)) = (0.16, 0.21), and a peak current efficiency of 0.52 cd A(-1) at CIE(xy) = (0.17, 0.20) are achieved. These dendrimers are among the best dendritic systems so far for fluorescent blue light-emitting materials.
authors.affiliation: Max Planck Institute for Polymer Research, Ackermannweg 10, Mainz, D-55128, Germany.
authors.forename: Guang
authors.initials: G
authors.lastname: Zhang
authors.forename: Martin
authors.initials: M
authors.lastname: Baumgarten
authors.forename: Manuel
authors.initials: M
authors.lastname: Auer
authors.forename: Roman
authors.initials: R
authors.lastname: Trattnig
authors.forename: Emil J W
authors.initials: EJ
authors.lastname: List-Kratochvil
authors.forename: Klaus
authors.initials: K
authors.lastname: Müllen
mesh_terms: D050091:Dendrimers / Q000737:chemistry*; D055664:Electrochemical Techniques; D004735:Energy Transfer; D008027:Light; D015394:Molecular Structure; D055668:Photochemical Processes; D011108:Polymers / Q000737:chemistry*; D012996:Solutions; D013499:Surface Properties
chemical_list: D050091:Dendrimers; D011108:Polymers; D012996:Solutions; C041325:polyphenylene sulfide
keywords: blue; energy transfer; frontier molecular orbitals; organic light-emitting diodes; polyphenylene dendrimers