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|a 10.1002/adma.202307420
|2 doi
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|a pubmed24n1277.xml
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|a (NLM)37697624
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|a eng
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|a Meng, Guoyun
|e verfasserin
|4 aut
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|a B-N Covalent Bond Embedded Double Hetero-[n]helicenes for Pure Red Narrowband Circularly Polarized Electroluminescence with High Efficiency and Stability
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|c 2024
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|a Text
|b txt
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|a ƒaComputermedien
|b c
|2 rdamedia
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|a ƒa Online-Ressource
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|2 rdacarrier
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|a Date Revised 01.02.2024
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|a published: Print-Electronic
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|a Citation Status PubMed-not-MEDLINE
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|a © 2023 Wiley-VCH GmbH.
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|a Chiral B/N embedded multi-resonance (MR) emitters open a new paradigm of circularly polarized (CP) organic light-emitting diodes (OLEDs) owing to their unique narrowband spectra. However, pure-red CP-MR emitters and devices remain exclusive in literature. Herein, by introducing a B-N covalent bond to lower the electron-withdrawing ability of the para-positioned B-π-B motif, the first pair of pure-red double hetero-[n]helicenes (n = 6 and 7) CP-MR emitter peaking 617 nm with a small full-width at half-maximum of 38 nm and a high photoluminescence quantum yield of ≈100% in toluene is developed. The intense mirror-image CP light produced by the enantiomers is characterized by high photoluminescence dissymmetry factors (gPL ) of +1.40/-1.41 × 10-3 from their stable helicenes configuration. The corresponding devices using these enantiomers afford impressive CP electroluminescence dissymmetry factors (gEL ) of +1.91/-1.77 × 10-3 , maximum external quantum efficiencies of 36.6%/34.4% and Commission Internationale de I'Éclairage coordinates of (0.67, 0.33), exactly satisfying the red-color requirement specified by National Television Standards Committee (NTSC) standard. Notably a remarkable long LT95 (operational time to 95% of the initial luminance) of ≈400 h at an initial brightness of 10,000 cd m-2 is also observed for the same device, representing the most stable CP-OLED up to date
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|a Journal Article
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|a circularly polarized electroluminescence
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|a multi-resonance
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|a operational stability
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|a organic light-emitting diodes
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|a pure-red emission
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|a Zhou, Jianping
|e verfasserin
|4 aut
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|a Han, Xu-Shuang
|e verfasserin
|4 aut
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|a Zhao, Wenlong
|e verfasserin
|4 aut
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|a Zhang, Yuewei
|e verfasserin
|4 aut
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|a Li, Meng
|e verfasserin
|4 aut
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|a Chen, Chuan-Feng
|e verfasserin
|4 aut
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|a Zhang, Dongdong
|e verfasserin
|4 aut
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|a Duan, Lian
|e verfasserin
|4 aut
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| 773 |
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|i Enthalten in
|t Advanced materials (Deerfield Beach, Fla.)
|d 1998
|g 36(2024), 5 vom: 11. Feb., Seite e2307420
|w (DE-627)NLM098206397
|x 1521-4095
|7 nnns
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|g volume:36
|g year:2024
|g number:5
|g day:11
|g month:02
|g pages:e2307420
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|u http://dx.doi.org/10.1002/adma.202307420
|3 Volltext
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