Thermally activated delayed fluorescence emitters with intramolecular proton transfer for high luminance solution-processed organic light-emitting diodes

Abhishek Gupta, Wenbo Li, Arvydas Ruseckas, Cheng Lian, Cameron Lewis Carpenter-Warren, David Bradford Cordes, Alexandra Martha Zoya Slawin, Denis Jacquemin, Ifor David William Samuel, Eli Zysman-Colman

Research output: Contribution to journalArticlepeer-review

30 Citations (Scopus)
6 Downloads (Pure)

Abstract

We report an organic emitter containing a β-triketone electron acceptor core and
phenoxazine as the electron donors (TPXZBM) for solution-processed organic light-emitting diodes (OLEDs). The resulting molecule is very unusual because it shows both thermally activated delayed fluorescence (TADF) and intramolecular proton transfer. We compare its performance with the previously reported diketone analogue PXZPDO. Solution-processed OLEDs of PXZPDO and TPXZBM show maximum external quantum efficiencies of 20.1% and 12.7%, respectively. The results obtained for the solution-processed PXZPDO-based device are as good as the previously reported evaporated device. At a very high luminance of 10,000 cd/m2 the efficiency of the OLEDs was 10.6% for PXZPDO and 4.7% for TPXZBM, demonstrating relatively low efficiency roll-off for TADF materials. The low efficiency roll-off was rationalized on the basis of the short delayed lifetimes of 1.35 μs for PXZPDO and 1.44 μs for TPXZBM. Our results suggest that intramolecular proton transfer may be useful for the design of OLED materials with low efficiency roll-off.
Original languageEnglish
JournalACS Applied Materials & Interfaces
VolumeArticles ASAP
Early online date30 Mar 2021
DOIs
Publication statusE-pub ahead of print - 30 Mar 2021

Keywords

  • ESIPT
  • Proton transfer
  • TADF
  • OLEDs
  • Roll-off efficiency
  • Luminescence

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