Multi-Resonance Thermally Activated Delayed Fluorescence Emitters for Pure Blue OLEDs with Suppressed Efficiency Roll-Off

Ezhakudiyan Ravindran, Hee Won Son, Yerin Kim, Min Chul Suh

Research output: Contribution to journalConference articlepeer-review

Abstract

Herein, we demonstrate versatile narrowband deep blue MR-TADF emitters (KHU 1 and KHU 2) featuring enlarged ring-fused and structurally increased steric hindrance and rigidity accessed by incorporating meta-xylene rotors. In comparison to KHU 1, tri meta-xylene substituted emitter (KHU 2) exhibits a substantial blue shift (12 nm) while maintaining MR-TADF characteristics with high color purity (FWHM = 27 nm). Further, the solid-state investigations conclude that they possibly suppress the non-radiative energy loss and thus improve fast reverse intersystem crossing rate (kRISC 2.8 x 105 S-1) and photoluminescence quantum yield > 90%. Fabricated HF-OLEDs with these emitters show excellent external quantum efficiency of over 26% with ultra-low efficiency roll-off.

Original languageEnglish
Pages (from-to)591-594
Number of pages4
JournalDigest of Technical Papers - SID International Symposium
Volume54
Issue number1
DOIs
Publication statusPublished - 2023
EventSID International Symposium Digest of Technical Papers, 2023 - Los Angeles, United States
Duration: 21 May 202326 May 2023

Bibliographical note

Publisher Copyright:
© 2023, John Wiley and Sons Inc. All rights reserved.

Keywords

  • Multiple resonance effect
  • extended π-skeleton
  • meta-xylyl substituent
  • narrowband blue emission
  • ultra-low efficiency roll-off

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