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Improving the stability and color purity of a BT.2020 blue multiresonance emitter by alleviating hydrogen repulsion

Stable deep blue multiresonance emitters with small full width at half maximum (FWHM) are attractive for wide color-gamut organic light-emitting diodes (OLEDs). However, the steric repulsion from the spatially close hydrogens would twist the multiresonance skeletons, causing spectral broadening and...

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Autores principales: Wang, Xiang, Wang, Lu, Meng, Guoyun, Zeng, Xuan, Zhang, Dongdong, Duan, Lian
Formato: Online Artículo Texto
Lenguaje:English
Publicado: American Association for the Advancement of Science 2023
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10181185/
https://www.ncbi.nlm.nih.gov/pubmed/37172084
http://dx.doi.org/10.1126/sciadv.adh1434
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author Wang, Xiang
Wang, Lu
Meng, Guoyun
Zeng, Xuan
Zhang, Dongdong
Duan, Lian
author_facet Wang, Xiang
Wang, Lu
Meng, Guoyun
Zeng, Xuan
Zhang, Dongdong
Duan, Lian
author_sort Wang, Xiang
collection PubMed
description Stable deep blue multiresonance emitters with small full width at half maximum (FWHM) are attractive for wide color-gamut organic light-emitting diodes (OLEDs). However, the steric repulsion from the spatially close hydrogens would twist the multiresonance skeletons, causing spectral broadening and molecular instability issues. Here, we strategically introduce a mesitylboron locking unit into a carbazole-embedded multiresonance model emitter, alleviating the hydrogen repulsions and also strengthening the para-positioned weak carbon-nitrogen bond in anionic states. An emission peaking at 452 nm with an FWHM of merely 14 nm and nearly BT.2020 blue chromaticity coordinates are obtained in toluene, affording a high maximum external quantum efficiency of 33.9% in a sensitizing device. Moreover, an impressive LT97 (time to decay to 97% of the initial luminance) of 178 hours at a constant current density of 12 mA/cm(2) was achieved in a stable device with a small y coordinate of 0.057, nearly 20 times longer than the model emitter with even a substantially red-shifted emission.
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spelling pubmed-101811852023-05-13 Improving the stability and color purity of a BT.2020 blue multiresonance emitter by alleviating hydrogen repulsion Wang, Xiang Wang, Lu Meng, Guoyun Zeng, Xuan Zhang, Dongdong Duan, Lian Sci Adv Physical and Materials Sciences Stable deep blue multiresonance emitters with small full width at half maximum (FWHM) are attractive for wide color-gamut organic light-emitting diodes (OLEDs). However, the steric repulsion from the spatially close hydrogens would twist the multiresonance skeletons, causing spectral broadening and molecular instability issues. Here, we strategically introduce a mesitylboron locking unit into a carbazole-embedded multiresonance model emitter, alleviating the hydrogen repulsions and also strengthening the para-positioned weak carbon-nitrogen bond in anionic states. An emission peaking at 452 nm with an FWHM of merely 14 nm and nearly BT.2020 blue chromaticity coordinates are obtained in toluene, affording a high maximum external quantum efficiency of 33.9% in a sensitizing device. Moreover, an impressive LT97 (time to decay to 97% of the initial luminance) of 178 hours at a constant current density of 12 mA/cm(2) was achieved in a stable device with a small y coordinate of 0.057, nearly 20 times longer than the model emitter with even a substantially red-shifted emission. American Association for the Advancement of Science 2023-05-12 /pmc/articles/PMC10181185/ /pubmed/37172084 http://dx.doi.org/10.1126/sciadv.adh1434 Text en Copyright © 2023 The Authors, some rights reserved; exclusive licensee American Association for the Advancement of Science. No claim to original U.S. Government Works. Distributed under a Creative Commons Attribution License 4.0 (CC BY). https://creativecommons.org/licenses/by/4.0/This is an open-access article distributed under the terms of the Creative Commons Attribution license (https://creativecommons.org/licenses/by/4.0/) , which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
spellingShingle Physical and Materials Sciences
Wang, Xiang
Wang, Lu
Meng, Guoyun
Zeng, Xuan
Zhang, Dongdong
Duan, Lian
Improving the stability and color purity of a BT.2020 blue multiresonance emitter by alleviating hydrogen repulsion
title Improving the stability and color purity of a BT.2020 blue multiresonance emitter by alleviating hydrogen repulsion
title_full Improving the stability and color purity of a BT.2020 blue multiresonance emitter by alleviating hydrogen repulsion
title_fullStr Improving the stability and color purity of a BT.2020 blue multiresonance emitter by alleviating hydrogen repulsion
title_full_unstemmed Improving the stability and color purity of a BT.2020 blue multiresonance emitter by alleviating hydrogen repulsion
title_short Improving the stability and color purity of a BT.2020 blue multiresonance emitter by alleviating hydrogen repulsion
title_sort improving the stability and color purity of a bt.2020 blue multiresonance emitter by alleviating hydrogen repulsion
topic Physical and Materials Sciences
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10181185/
https://www.ncbi.nlm.nih.gov/pubmed/37172084
http://dx.doi.org/10.1126/sciadv.adh1434
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