A Boron, Nitrogen,and Oxygen Doped π-Extended Helical Pure Blue Multiresonant Thermally Activated Delayed Fluorescent Emitter for Organic Light Emitting Diodes That Shows Fast kRISC Without the Use of Heavy Atoms

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

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Author(s)

  • Rangani Wathsala Weerasinghe
  • Subeesh Madayanad Suresh
  • David Hall
  • Tomas Matulaitis
  • Alexandra M.Z. Slawin
  • Stuart Warriner
  • Yi-Ting Lee
  • Youichi Tsuchiya
  • Eli Zysman-Colman
  • Chihaya Adachi

Detail(s)

Original languageEnglish
Article number2402289
Journal / PublicationAdvanced Materials
Online published5 Apr 2024
Publication statusOnline published - 5 Apr 2024

Abstract

Narrowband emissive multiresonant thermally activated delayed fluorescence (MR-TADF) emitters are a promising solution to achieve the current industry targeted color standard, BT.2020, for blue color without using optical filters, aiming for high efficiency organic light-emitting diodes (OLEDs). However, their long triplet lifetimes, largely affected by their slow reverse intersystem crossing rates, adversely affect device stability. In this study, a helical MR-TADF emitter (ƒ-DOABNA) has been designed and synthesized. Because of its π-delocalized structure, ƒ-DOABNA possesses a small singlet-triplet gap, ΔEST, and displays simultaneously an exceptionally faster reverse intersystem crossing rate constant, kRISC, of up to 2 × 106 s−1 and a very high photoluminescence quantum yield, ΦPL, of over 90% in both solution and doped films. The OLED with ƒ-DOABNA as the emitter achieved a narrow deep-blue emission at 445 nm (full width at half-maximum of 24 nm) associated with CIE coordinates of 0.150, 0.041, and showed a high maximum external quantum efficiency, EQEmax, of ∼20%.

Citation Format(s)

A Boron, Nitrogen,and Oxygen Doped π-Extended Helical Pure Blue Multiresonant Thermally Activated Delayed Fluorescent Emitter for Organic Light Emitting Diodes That Shows Fast kRISC Without the Use of Heavy Atoms. / Weerasinghe, Rangani Wathsala; Madayanad Suresh, Subeesh; Hall, David et al.
In: Advanced Materials, 05.04.2024.

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