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Highly efficient and air-stable Eu(II)-containing azacryptates ready for organic light-emitting diodes

Divalent europium 5d-4f transition has aroused great attention in many fields, in a way of doping Eu(2+) ions into inorganic solids. However, molecular Eu(2+) complexes with 5d-4f transition are thought to be too air-unstable to explore their applications. In this work, we synthesized four Eu(2+)-co...

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Autores principales: Li, Jiayi, Wang, Liding, Zhao, Zifeng, Sun, Boxun, Zhan, Ge, Liu, Huanyu, Bian, Zuqiang, Liu, Zhiwei
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group UK 2020
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7562750/
https://www.ncbi.nlm.nih.gov/pubmed/33060573
http://dx.doi.org/10.1038/s41467-020-19027-x
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author Li, Jiayi
Wang, Liding
Zhao, Zifeng
Sun, Boxun
Zhan, Ge
Liu, Huanyu
Bian, Zuqiang
Liu, Zhiwei
author_facet Li, Jiayi
Wang, Liding
Zhao, Zifeng
Sun, Boxun
Zhan, Ge
Liu, Huanyu
Bian, Zuqiang
Liu, Zhiwei
author_sort Li, Jiayi
collection PubMed
description Divalent europium 5d-4f transition has aroused great attention in many fields, in a way of doping Eu(2+) ions into inorganic solids. However, molecular Eu(2+) complexes with 5d-4f transition are thought to be too air-unstable to explore their applications. In this work, we synthesized four Eu(2+)-containing azacryptates EuX(2)-N(n) (X = Br, I, n = 4, 8) and systematically studied the photophysical properties in crystalline samples and solutions. Intriguingly, the EuX(2)-N(8) complexes exhibit near-unity photoluminescence quantum yield, good air-/thermal-stability and mechanochromic property (X = I). Furthermore, we proved the application of Eu(2+) complexes in organic light-emitting diodes (OLEDs) with high efficiency and luminance. The optimized device employing EuI(2)-N(8) as emitter has the best performance as the maximum luminance, current efficiency, and external quantum efficiency up to 25470 cd m(−2), 62.4 cd A(−1), and 17.7%, respectively. Our work deepens the understanding of structure-property relationship in molecular Eu(2+) complexes and could inspire further research on application in OLEDs.
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spelling pubmed-75627502020-10-19 Highly efficient and air-stable Eu(II)-containing azacryptates ready for organic light-emitting diodes Li, Jiayi Wang, Liding Zhao, Zifeng Sun, Boxun Zhan, Ge Liu, Huanyu Bian, Zuqiang Liu, Zhiwei Nat Commun Article Divalent europium 5d-4f transition has aroused great attention in many fields, in a way of doping Eu(2+) ions into inorganic solids. However, molecular Eu(2+) complexes with 5d-4f transition are thought to be too air-unstable to explore their applications. In this work, we synthesized four Eu(2+)-containing azacryptates EuX(2)-N(n) (X = Br, I, n = 4, 8) and systematically studied the photophysical properties in crystalline samples and solutions. Intriguingly, the EuX(2)-N(8) complexes exhibit near-unity photoluminescence quantum yield, good air-/thermal-stability and mechanochromic property (X = I). Furthermore, we proved the application of Eu(2+) complexes in organic light-emitting diodes (OLEDs) with high efficiency and luminance. The optimized device employing EuI(2)-N(8) as emitter has the best performance as the maximum luminance, current efficiency, and external quantum efficiency up to 25470 cd m(−2), 62.4 cd A(−1), and 17.7%, respectively. Our work deepens the understanding of structure-property relationship in molecular Eu(2+) complexes and could inspire further research on application in OLEDs. Nature Publishing Group UK 2020-10-15 /pmc/articles/PMC7562750/ /pubmed/33060573 http://dx.doi.org/10.1038/s41467-020-19027-x Text en © The Author(s) 2020 Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.
spellingShingle Article
Li, Jiayi
Wang, Liding
Zhao, Zifeng
Sun, Boxun
Zhan, Ge
Liu, Huanyu
Bian, Zuqiang
Liu, Zhiwei
Highly efficient and air-stable Eu(II)-containing azacryptates ready for organic light-emitting diodes
title Highly efficient and air-stable Eu(II)-containing azacryptates ready for organic light-emitting diodes
title_full Highly efficient and air-stable Eu(II)-containing azacryptates ready for organic light-emitting diodes
title_fullStr Highly efficient and air-stable Eu(II)-containing azacryptates ready for organic light-emitting diodes
title_full_unstemmed Highly efficient and air-stable Eu(II)-containing azacryptates ready for organic light-emitting diodes
title_short Highly efficient and air-stable Eu(II)-containing azacryptates ready for organic light-emitting diodes
title_sort highly efficient and air-stable eu(ii)-containing azacryptates ready for organic light-emitting diodes
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7562750/
https://www.ncbi.nlm.nih.gov/pubmed/33060573
http://dx.doi.org/10.1038/s41467-020-19027-x
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