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 language | English |
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Pages (from-to) | 591-594 |
Number of pages | 4 |
Journal | Digest of Technical Papers - SID International Symposium |
Volume | 54 |
Issue number | 1 |
DOIs | |
Publication status | Published - 2023 |
Event | SID International Symposium Digest of Technical Papers, 2023 - Los Angeles, United States Duration: 21 May 2023 → 26 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