Photophysics of Deep Blue Acridane- and Benzonitrile-Based Emitter Employing Thermally Activated Delayed Fluorescence

Nikita A. Drigo, Liudmila G. Kudriashova, Sebastian Weissenseel, Andreas Sperlich, Aron Joel Huckaba, Mohammad Khaja Nazeeruddin, Vladimir Dyakonov

Research output: Contribution to journalArticlepeer-review

15 Scopus citations

Abstract

We designed and synthesized a new organic light-emitting diode (OLED) emitter, SBABz4, containing spiro-biacridine donor (D) in the core surrounded by two benzonitrile acceptors (A). The dual A-DxD-A structure is shown to provide pure-blue emission in relation to its single A-D counterpart. Time-resolved photoluminescence (TRPL) recorded in the broad dynamic range from solutions and solid films revealed three emission components: prompt fluorescence, phosphorescence, and efficient thermally activated delayed fluorescence (TADF). The last is independently proven by temperature-dependent TRPL and oxygen-quenching PL experiment. From the PL lifetimes and quantum yield, we estimated maximum external quantum efficiency of 7.1% in SBABz4-based OLEDs and demonstrated 6.8% in a working device.

Original languageEnglish
Pages (from-to)22796-22801
Number of pages6
JournalJournal of Physical Chemistry C
Volume122
Issue number39
DOIs
StatePublished - Oct 4 2018

Bibliographical note

Funding Information:
L.G.K., A.S., and V.D. acknowledge the EU H2020 for funding through the Grant SEPOMO (Marie Skłodowska-Curie Grant Agreement 722651). S.W. acknowledges the funding from DFG FOR1809.

Publisher Copyright:
© 2018 American Chemical Society.

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Energy (all)
  • Physical and Theoretical Chemistry
  • Surfaces, Coatings and Films

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