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OBO-Fused Benzo[fg]tetracene as Acceptor With Potential for Thermally Activated Delayed Fluorescence Emitters

Zhang, Zhen; Kumar, Shiv; Bagnich, Sergey; Spuling, Eduard; Hundemer, Fabian; Nieger, Martin; Hassan, Zahid; Köhler, Anna; Zysman-Colman, Eli; Bräse, Stefan

Abstract:
Six luminophores bearing an OBO-fused benzo[fg]tetracene core as an electron acceptor were designed and synthesized. The molecular structures of three molecules (PXZ-OBO, 5PXZ-OBO, 5DMAC-OBO) were determined by single crystal X-ray diffraction studies and revealed significant torsion between the donor moieties and the OBO acceptor with dihedral angles between 75.5 and 86.2°. Photophysical studies demonstrate that blue and deep blue emission can be realized with photoluminescence maxima (λ$_{PL}$) ranging from 415 to 480 nm in mCP films. The emission energy is modulated by simply varying the strength of the donor heterocycle, the number of donors, and their position relative to the acceptor. Although the DMAC derivatives show negligible delayed emission because of their large singlet-triplet excited state energy difference, ΔE$_{ST}$, PXZ-based molecules, especially PXZ-OBO with an experimental ΔE$_{ST}$ of 0.25 eV, demonstrate delayed emission in blend mCP films at room temperature, which suggests triplet exciton harvesting occurs in these samples, potentially by thermally activated delayed fluorescence.

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Verlagsausgabe §
DOI: 10.5445/IR/1000126851
Veröffentlicht am 26.11.2020
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Biologische und Chemische Systeme (IBCS)
Institut für Organische Chemie (IOC)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2020
Sprache Englisch
Identifikator ISSN: 2296-2646
KITopen-ID: 1000126851
HGF-Programm 47.01.01 (POF III, LK 01) Biol.Netzwerke u.Synth.Regulat. ITG+ITC
Erschienen in Frontiers in Chemistry
Band 8
Seiten Art. Nr.: 563411
Vorab online veröffentlicht am 30.09.2020
Schlagwörter boron emitters, fluorescence, OLED, TADF, boron
Nachgewiesen in Scopus
Web of Science
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