Efficient sky-blue organic light-emitting diodes using a highly horizontally oriented thermally activated delayed fluorescence emitter

Zhen Zhang, Ettore Crovini, Paloma Lays dos Santos, Bilal A. Naqvi, David Bradford Cordes, Alexandra Martha Zoya Slawin, Prakhar Sahay, Wolfgang Brütting, Ifor David William Samuel, Stefan Bräse, Eli Zysman-Colman

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30 Citations (Scopus)
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Abstract

Organic thermally activated delayed fluorescent (TADF) materials can harvest 100% of the electrically generated excitons as a result of their small singlet-triplet energy difference. However, maximizing the External Quantum Efficiency (EQE) of a device also requires enhancing the light-outcoupling efficiency. In this work, we present a new Acceptor-Donor-Acceptor (ADA) emitter employing an indolocarbazole donor and diphenyltriazine acceptors that shows nearly-completely horizontal orientation regardless of the host matrix, leading to a sky-blue OLED (λEL=483nm, CIE coordinates of 0.17, 0.32) with EQEMAX of 22.1%, a maximum luminance of 7800 cd/m2 and blue emission.
Original languageEnglish
Article number2001354
Number of pages8
JournalAdvanced Optical Materials
Volume8
Issue number23
Early online date23 Oct 2020
DOIs
Publication statusPublished - 3 Dec 2020

Keywords

  • TADF emitters
  • Horizontal orientation
  • Outcoupling effect
  • Indolocarbazole
  • Triazine
  • Acceptor-donor-acceptor
  • Blue emitters
  • OLEDs

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