Ionic multiresonant thermally activated delayed fluorescence emitters for light emitting electrochemical cells

Merve Karaman, Abhishek Kumar Gupta, Subeesh Madayanad Suresh, Tomas Matulaitis, Lorenzo Mardegan, Daniel Tordera*, Henk J Bolink, Sen Wu, Stuart Warriner, Ifor D Samuel, Eli Zysman-Colman*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

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Abstract

We designed and synthesized two new ionic thermally activated delayed fluorescent (TADF) emitters that are charged analogues of a known multiresonant TADF (MR-TADF) compound, DiKTa. The emission of the charged derivatives is red-shifted compared to the parent compound. For instance, DiKTa-OBuIm emits in the green (λPL = 499 nm, 1 wt % in mCP) while DiKTa-DPA-OBuIm emits in the red (λPL = 577 nm, 1 wt % in mCP). In 1 wt % mCP films, both emitters showed good photoluminescence quantum yields of 71% and 61%, and delayed lifetimes of 316.6 μs and 241.7 μs, respectively, for DiKTa-OBuIm and DiKTa-DPA-OBuIm, leading to reverse intersystem crossing rates of 2.85 × 103 s−1 and 3.04 × 103 s−1. Light-emitting electrochemical cells were prepared using both DiKTa-OBuIm and DiKTa-DPA-OBuIm as active emitters showing green (λmax = 534 nm) and red (λmax = 656 nm) emission, respectively.
Original languageEnglish
Pages (from-to)1311-1321
Number of pages11
JournalBeilstein Journal of Organic Chemistry
Volume18
DOIs
Publication statusPublished - 22 Sept 2022

Keywords

  • Thermally activated delayed fluorescence
  • Multiresonance
  • Purely organic emitters
  • Electroluminescence
  • Light-emitting electrochemical cells

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