Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 61, Issue 14, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.202117181
Keywords
Bathochromic Shift; Device Stability; Homogeneous Hexatomic Rings; Multiple Resonance; Narrow Energy Gap
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Funding
- National Key Basic Research and Development Program of China [2017YFA0204501, 2020YFA0715000]
- Guangdong Major Project of Basic and Applied Basic Research [2019B030302009]
- National Science Fund of China [51903137, 61890942]
- Foshan Xianhu Laboratory of the Advanced Energy Science and Technology Guangdong Laboratory [XHT2020-005]
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In this study, homogeneous hexatomic rings are introduced into nitrogen-embedded multi-resonance skeletons, prolonging the pi-conjugation length and retaining the non-bonding character. The resulting emitters exhibit high quantum yields, narrow bandwidths, and excellent performance.
Nitrogen-containing polycyclic heteroaromatics have exhibited fascinating multi-resonance (MR) characteristics for efficient narrowband emission, but strategies to bathochromic shift their emissions while maintaining the narrow bandwidths remain exclusive. Here, homogeneous hexatomic rings are introduced into nitrogen-embedded MR skeletons to prolong the pi-conjugation length for low-energy electronic transitions while retaining the non-bonding character of the remaining parts. The proof-of-the-concept emitters exhibit near unity photoluminescence quantum yields with peaks at 598 nm and 620 nm and small full-width-at-half-maximums of 28 nm and 31 nm, respectively. Optimal organic light-emitting diodes exhibit a high external quantum efficiency of 18.2 %, negligible efficiency roll-off, and ultra-long lifetime with negligible degradation at an initial luminance of 10 000 cd m(-2) after 94 hours.
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