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Showing 1–5 of 5 results
Advanced filters: Author: "David Beljonne" Clear advanced filters

  • Singlet fission — the splitting of a singlet exciton into two triplets — is a process that could be exploited to improve the power conversion efficiency of solar cells. Spectroscopic data now suggest that coherent and incoherent mechanisms for singlet fission in crystalline hexacene coexist and occur on different timescales.

    • Nicholas R. Monahan
    • Dezheng Sun
    • X.-Y. Zhu
    Research
    Nature Chemistry
    Volume: 9, P: 341-346

  • Dynamic disorder reduces the carrier mobility in organic semiconductors (OSs) to an extent that depends on their specific electronic band structure. Here the authors study the temperature-dependent hole mobility of two structurally similar OSs and find that thermal access to transiently delocalized states enhances hole mobility in C8-DNTT-C8 compared to DNTT.

    • Samuele Giannini
    • Lucia Di Virgilio
    • David Beljonne
    Research
    Nature Materials
    Volume: 22, P: 1361-1369

  • A low singlet-triplet energy gap, necessary for delayed fluorescence organic semiconductors, results in a small radiative rate that limits performance in OLEDs. Here, the authors show that it is possible to reconcile these conflicting requirements in materials that can access both high oscillator strength intramolecular excitations and intermolecular charge transfer states.

    • Alexander J. Gillett
    • Claire Tonnelé
    • Richard H. Friend
    ResearchOpen Access
    Nature Communications
    Volume: 12, P: 1-10

  • A substantial pathway for energy loss in organic solar cells may be suppressed by engineering hybridization between non-fullerene acceptor triplet excitons and spin-triplet charge transfer excitons.

    • Alexander J. Gillett
    • Alberto Privitera
    • Richard H. Friend
    Research
    Nature
    Volume: 597, P: 666-671

  • The role of the dielectric environment in thermally activated delayed fluorescence (TADF) is not yet fully understood. Here the authors reveal the relevance of environment–emitter interactions in gating the reverse intersystem crossing and its particular relevance in dipolar TADF emitters.

    • Alexander J. Gillett
    • Anton Pershin
    • David Beljonne
    Research
    Nature Materials
    Volume: 21, P: 1150-1157