Judicious heteroatom doping produces high-performance deep blue/near-UV multiresonant thermally activated delayed fluorescence OLEDs

Subeesh Madayanad Suresh, Le Zhang, Tomas Matulaitis, David Hall, Changfeng Si, Gaetano Ricci, Alexandra M. Z. Slawin, Stuart Warriner, David Beljonne, Yoann Olivier, Ifor D. W. Samuel*, Eli Zysman-Colman*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

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Abstract

Two multiresonant thermally activated delayed fluorescence (MR-TADF) emitters are presented and it is shown how further borylation of a deep-blue MR-TADF emitter, DIDOBNA-N, both blueshifts and narrows the emission producing a new near-UV MR-TADF emitter, MesB-DIDOBNA-N, are shown. DIDOBNA-N emits bright blue light (ΦPL = 444 nm, FWHM = 64 nm, ΦPL = 81%, τd = 23 ms, 1.5 wt% in TSPO1). The deep-blue organic light-emitting diode (OLED) based on this twisted MR-TADF compound shows a very high maximum external quantum efficiency (EQEmax) of 15.3% for a device with CIEy of 0.073. The fused planar MR-TADF emitter, MesB-DIDOBNA-N shows efficient and narrowband near-UV emission (λPL = 402 nm, FWHM = 19 nm, ΦPL = 74.7%, τd = 133 ms, 1.5 wt% in TSPO1). The best OLED with MesB-DIDOBNA-N, doped in a co-host, shows the highest efficiency reported for a near-UV OLED at 16.2%. With a CIEy coordinate of 0.049, this device also shows the bluest EL reported for a MR-TADF OLED to date.
Original languageEnglish
Article number2300997
JournalAdvanced Materials
Volume35
Issue number33
Early online date6 Jul 2023
DOIs
Publication statusPublished - 17 Aug 2023

Keywords

  • Boron
  • Deep-blue emitters
  • Multiresonant thermally activated delayed fluorescence
  • Near-UV emitters
  • Organic light-emitting diodes (OLEDs)

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