Hypsochromic Shift of Multiple-Resonance-Induced Thermally Activated Delayed Fluorescence by Oxygen Atom Incorporation

Hiroyuki Tanaka, Susumu Oda, Gaetano Ricci, Hajime Gotoh, Keita Tabata, Ryosuke Kawasumi, David Beljonne, Yoann Olivier, Takuji Hatakeyama

Research output: Contribution to journalArticlepeer-review

Abstract

Herein, we reported an ultrapure blue multiple-resonance-induced thermally activated delayed fluorescence (MR-TADF) material (ν-DABNA-O-Me) with a high photoluminescence quantum yield and a large rate constant for reverse intersystem crossing. Because of restricted π-conjugation of the HOMO rather than the LUMO induced by oxygen atom incorporation, ν-DABNA-O-Me shows a hypsochromic shift compared to the parent MR-TADF material (ν-DABNA). An organic light-emitting diode based on this material exhibits an emission at 465 nm, with a small full-width at half-maximum of 23 nm and Commission Internationale de l'Eclairage coordinates of (0.13, 0.10), and a high maximum external quantum efficiency of 29.5 %. Moreover, ν-DABNA-O-Me facilitates a drastically improved efficiency roll-off and a device lifetime compared to ν-DABNA, which demonstrates significant potential of the oxygen atom incorporation strategy.

Original languageEnglish
Pages (from-to)17910-17914
Number of pages5
JournalAngewandte Chemie - International Edition
Volume60
Issue number33
Early online date26 May 2021
DOIs
Publication statusPublished - 9 Aug 2021

Keywords

  • deep blue
  • multiple resonance effect
  • narrowband emission
  • organic light-emitting diodes
  • thermally activated delayed fluorescence

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