Critical role of additive-induced molecular interaction on the operational stability of perovskite light-emitting diodes

0541446 - ÚMCH 2022 RIV US eng J - Journal Article
Kuang, C. - Hu, Z. - Yuan, Z. - Wen, K. - Qing, J. - Kobera, Libor - Abbrent, Sabina - Brus, Jiří - Yin, C. - Wang, H. - Xu, W. - Wang, J. - Bai, S. - Gao, F.
Critical role of additive-induced molecular interaction on the operational stability of perovskite light-emitting diodes.
Joule. Roč. 5, č. 3 (2021), s. 618-630. ISSN 2542-4351. E-ISSN 2542-4351
Institutional support: RVO:61389013
Keywords : metal halide perovskite * light-emitting diode * operational stability
OECD category: Polymer science
Impact factor: 46.048, year: 2021
Method of publishing: Open access
https://www.sciencedirect.com/science/article/pii/S2542435121000039?via%3Dihub

Despite rapid improvements in efficiency and brightness of perovskite light-emitting diodes (PeLEDs), the poor operational stability remains a critical challenge hindering their practical applications. Here, we demonstrate greatly improved operational stability of high-efficiency PeLEDs, enabled by incorporating dicarboxylic acids into the precursor for perovskite depositions. We reveal that the dicarboxylic acids efficiently eliminate reactive organic ingredients in perovskite emissive layers through an in situ amidation process, which is catalyzed by the alkaline zinc oxide substrate. The formed stable amides prohibit detrimental reactions between the perovskites and the charge injection layer underneath, stabilizing the perovskites and the interfacial contacts and ensuring the excellent operational stability of the resulting PeLEDs. Through rationally optimizing the amidation reaction in the perovskite emissive layers, we achieve efficient PeLEDs with a peak external quantum efficiency of 18.6% and a long half-life time of 682 h at 20 mA cm−2, presenting an important breakthrough in PeLEDs.
Permanent Link: http://hdl.handle.net/11104/0318998