Highly efficient green and red narrowband emissive organic light-emitting diodes employing multi-resonant thermally activated delayed fluorescence emitters

Sen Wu, Abhishek Kumar Gupta, Kou Yoshida, Junyi Gong, David Hall, David B. Cordes, Alexandra M. Z. Slawin, Ifor D. W. Samuel*, Eli Zysman-Colman*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

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Abstract

Herein, we demonstrate how judicious selection of donor decorating a central multi-resonant thermally activated delayed fluorescence (MR-TADF) core based on DiKTa can lead to very high-performance OLEDs. Decorating the DiKTa core with triphenylamine (TPA) and diphenylamine (DPA), 3TPA-DiKTa and 3DPA-DiKTa exhibit bright, narrowband green and red emission in doped films, respectively. The OLEDs based on these emitters showed record-high performance with maximum external quantum efficiencies (EQEmax) for this family of emitters, with a EQEmax of 30.8% for 3TPA-DiKTa at λEL of 551 nm and 16.7% for 3DPA-DiKTa at λEL of 613 nm. The efficiency roll-off in the OLEDs was improved significantly by using 4CzIPN as an assistant dopant in hyperfluorescence (HF) devices. The outstanding device performance has been attributed to preferential horizontal orientation of the transition dipole moments of 3TPA-DiKTa and 3DPA-DiKTa.
Original languageEnglish
Article numbere202213697
Number of pages9
JournalAngewandte Chemie International Edition
Volume61
Issue number52
Early online date23 Nov 2022
DOIs
Publication statusPublished - 23 Dec 2022

Keywords

  • Multi-resonant thermally activated delayed fluorescence
  • Organic light-emitting diodes
  • Horizontal orientation
  • Hyperfluorescence
  • Thermally activated delayed fluorescence (TADF)

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