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Engineering Blue Fluorescent Bulk Emitters for OLEDs: Triplet Harvesting by Green Phosphors
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    Engineering Blue Fluorescent Bulk Emitters for OLEDs: Triplet Harvesting by Green Phosphors
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    Institut für Angewandte Photophysik, Technische Universität Dresden, George-Bähr-Straße 1, 01069 Dresden, Germany
    Institut für Physikalische Chemie und Elektrochemie, Technische Universität Dresden, Mommsenstraße 13, 01062 Dresden, Germany
    § Physics Department, University of Durham, South Road, Durham DH1 3LE, United Kingdom
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    Chemistry of Materials

    Cite this: Chem. Mater. 2014, 26, 7, 2414–2426
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    https://doi.org/10.1021/cm500602y
    Published March 7, 2014
    Copyright © 2014 American Chemical Society

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    Triplet harvesting in organic light-emitting diodes (OLEDs) from a blue fluorescent to a green phosphorescent emitter is important for the development of highly efficient white OLEDs for lighting applications. Here, we report new blue fluorescent bulk emitters with high triplet energies for triplet harvesting in OLEDs. Based on the chemical structure of the highly efficient blue emitter N,N′-di-1-naphthalenyl-N,N′-diphenyl-[1,1′:4′,1″:4″,1‴-quaterphenyl]-4,4‴ diamine (4P-NPD), two new quarterphenylene compounds are designed and synthesized. Their experimentally obtained ionization potentials, singlet, and triplet levels are compared to quantum chemical calculations. We show that the incorporation of repulsive methyl groups leads to a twist of the outer phenyl rings of the molecule and increases the triplet level. Finally, triplet harvesting OLEDs comprising these two new compounds as bulk emitters are electrically and optically characterized. We demonstrate that both materials allow triplet harvesting by the green phosphorescent emitter iridium(III)bis(2-phenylpyridinato-N,C2′)acetylacetonate (Ir(ppy)2(acac)).

    Copyright © 2014 American Chemical Society

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    This article is cited by 17 publications.

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    Chemistry of Materials

    Cite this: Chem. Mater. 2014, 26, 7, 2414–2426
    Click to copy citationCitation copied!
    https://doi.org/10.1021/cm500602y
    Published March 7, 2014
    Copyright © 2014 American Chemical Society

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