Merging boron and carbonyl based MR-TADF emitter designs to achieve high performance pure blue OLEDs

Sen Wu, Le Zhang, Jingxiang Wang, Abhishek Kumar Gupta, Ifor David William Samuel*, Eli Zysman-Colman*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


Multiresonant thermally activated delayed fluorescence (MR-TADF) compounds are attractive as emitters for organic light-emitting diodes (OLEDs) as they can simultaneously harvest both singlet and triplet excitons to produce light in the device and show very narrow emission spectra, which translates to excellent color purity. Here, we report the first example of an MR-TADF emitter (DOBDiKTa) that fuses together fragments from the two major classes of MR-TADF compounds, those containing boron (DOBNA) and those containing carbonyl groups (DiKTa) as acceptor fragments in the MR-TADF skeleton. The resulting molecular design, this compound shows desirable narrowband pure blue emission and efficient TADF character. The co-host OLED with DOBDiKTa as the emitter showed a maximum external quantum efficiency (EQEmax) of 17.4 %, an efficiency roll-off of 32 % at 100 cd m−2, and Commission Internationale de l’Éclairage (CIE) coordinates of (0.14, 0.12). Compared to DOBNA and DiKTa, DOBDiKTa shows higher device efficiency with reduced efficiency roll-off while maintaining a high color purity, which demonstrates the promise of the proposed molecular design.
Original languageEnglish
Article numbere202305182
Number of pages8
JournalAngewandte Chemie International Edition
Issue number28
Early online date5 Jun 2023
Publication statusPublished - 10 Jul 2023


  • Multiresonant thermally activated delayed fluorescence
  • Organic light-emitting diodes
  • Blue emitters
  • Narrowband emission
  • Boron


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