Boron-Based Multi-Resonance TADF Emitter with Suppressed Intermolecular Interaction and Isomer Formation for Efficient Pure Blue OLEDs
- Authors
- Cheon, Hyung Jin; Shin, Youn-Seob; Park, Noh-Hwal; Lee, Jeong-Hwan; Kim, Yun-Hi
- Issue Date
- May-2022
- Publisher
- WILEY-V C H VERLAG GMBH
- Keywords
- blue organic light-emitting diode (OLED); DABNA; multi-resonance emitters; thermally activated delayed fluorescent (TADF) emitters
- Citation
- SMALL, v.18, no.19
- Indexed
- SCIE
SCOPUS
- Journal Title
- SMALL
- Volume
- 18
- Number
- 19
- URI
- https://scholarworks.bwise.kr/gnu/handle/sw.gnu/1344
- DOI
- 10.1002/smll.202107574
- ISSN
- 1613-6810
- Abstract
- Multi-resonance (MR) thermally activated delayed fluorescent (TADF) emitters are highly attractive due to their superior color purity as well as efficient light-harvesting ability from singlets and triplets. However, boron and nitrogen-based MR-TADF emitters suffer from their strong pi-pi interaction owing to their rigid flat cores. Herein, a boron-based multi-resonance blue TADF emitter with suppressed intermolecular interaction and isomer formation is developed through a simple synthetic process by introducing meta-xylene and meta-phenyphenyl groups to the core. The MR-TADF emitter, mBP-DABNA-Me, shows a narrowband blue emission with a peak at 467 nm, along with full width at half maximum of 28 nm, and photoluminescence quantum yield of 97%. Notably, highly efficient pure blue organic light-emitting diode (OLED) is realized using mBP-DABNA-Me, showing a maximum external quantum efficiency of 24.3% and a stable blue emission with a Commission Internationale de L'Eclairage coordinate of (0.124, 0.140). The color purity of the OLED is maintained at a high doping concentration of over 20%, attributed to the suppressed intermolecular interaction between the MR emitters.
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