Color tuning of multi-resonant thermally activated delayed fluorescence emitters based on fully fused polycyclic amine/carbonyl frameworks

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review

11 Scopus Citations
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Author(s)

  • John Marques dos Santos
  • David Hall
  • Tomas Matulaitis
  • David B. Cordes
  • Alexandra M. Z. Slawin
  • Youichi Tsuchiya
  • Ludvig Edman
  • Chihaya Adachi
  • Yoann Olivier
  • Eli Zysman-Colman

Detail(s)

Original languageEnglish
Pages (from-to)8263-8273
Number of pages11
Journal / PublicationJournal of Materials Chemistry C
Volume11
Issue number24
Online published2 May 2023
Publication statusPublished - 28 Jun 2023
Externally publishedYes

Link(s)

Abstract

Two novel π-extended amine/carbonyl-based multi-resonance thermally activated delayed fluorescence (MR-TADF) emitters have been designed and synthesized. The two emitters are isomeric, composed of nine fused rings and show green-yellow emission. Sym-DiDiKTa and Asym-DiDiKTa possess tert-butyl groups distributed in a symmetrical and asymmetrical fashion, respectively, which significantly impact the single-crystal packing structure. The two compounds possess similar singlet-triplet energy gaps, ΔEST, of around 0.23 eV, narrowband emission characterized by a full-width at half-maximum, FWHM, of 29 nm and a photoluminescence quantum yield, ΦPL, of 70% and 53% for the symmetric and asymmetric counterparts, respectively, in toluene. Investigation in OLEDs demonstrated that the devices with Sym-DiDiKTa and Asym-DiDiKTa displayed electroluminescence maxima of 543 and 544 nm, and maximum external quantum efficiencies (EQEmax) of 9.8% and 10.5%, respectively. The maximum EQE was further improved to 19.9% by employing a hyperfluorescence strategy. We further present the first example of a neutral MR-TADF emitter incorporated in a LEC device where Sym-DiDiKTa acts as the emitter. The LEC shows a λEL at 551 nm andFWHM of 60 nm with luminance of 300 cd m-2 and a fast turn-on time of less than 2 s to 100 cd m-2. © The Royal Society of Chemistry 2023

Research Area(s)

Citation Format(s)

Color tuning of multi-resonant thermally activated delayed fluorescence emitters based on fully fused polycyclic amine/carbonyl frameworks. / dos Santos, John Marques; Chan, Chin-Yiu; Hall, David et al.
In: Journal of Materials Chemistry C, Vol. 11, No. 24, 28.06.2023, p. 8263-8273.

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review

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