Comprehensive defect suppression in perovskite nanocrystals for high-efficiency light-emitting diodes
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Comprehensive defect suppression in perovskite nanocrystals for high-efficiency light-emitting diodes

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Comprehensive defect suppression in perovskite nanocrystals for high-efficiency light-emitting diodes

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dc.contributor.author Kim, Y. H.
dc.contributor.author Kim, S.
dc.contributor.author Kakekhani, A.
dc.contributor.author Park, J.
dc.contributor.author Park, J.
dc.contributor.author Lee, Y. H.
dc.contributor.author Xu, H.
dc.contributor.author Nagane, S.
dc.contributor.author Wexler, R. B.
dc.contributor.author Kim, D. H.
dc.contributor.author Hyeon Jo, S.
dc.contributor.author Martínez Sarti, Laura
dc.contributor.author Tan, P.
dc.contributor.author Sadhanala, A.
dc.contributor.author Park, G. S.
dc.contributor.author Kim, Y. W.
dc.contributor.author Hu, B.
dc.contributor.author Bolink, Henk
dc.contributor.author Yoo, S.
dc.contributor.author Friend, R. H.
dc.contributor.author Rappe, A. M.
dc.contributor.author Lee, T.W.
dc.date.accessioned 2021-04-28T09:01:54Z
dc.date.available 2021-04-28T09:01:54Z
dc.date.issued 2021
dc.identifier.uri https://hdl.handle.net/10550/78955
dc.description.abstract Electroluminescence efficiencies of metal halide perovskite nanocrystals (PNCs) are limited by a lack of material strategies that can both suppress the formation of defects and enhance the charge carrier confinement. Here we report a one-dopant alloying strategy that generates smaller, monodisperse colloidal particles (confining electrons and holes, and boosting radiative recombination) with fewer surface defects (reducing non-radiative recombination). Doping of guanidinium into formamidinium lead bromide PNCs yields limited bulk solubility while creating an entropy-stabilized phase in the PNCs and leading to smaller PNCs with more carrier confinement. The extra guanidinium segregates to the surface and stabilizes the undercoordinated sites. Furthermore, a surface-stabilizing 1,3,5-tris(bromomethyl)-2,4,6-triethylbenzene was applied as a bromide vacancy healing agent. The result is highly efficient PNC-based light-emitting diodes that have current efficiency of 108 cd A−1 (external quantum efficiency of 23.4%), which rises to 205 cd A−1 (external quantum efficiency of 45.5%) with a hemispherical lens
dc.language.iso eng
dc.relation.ispartof Nature Photonics, 2021, vol. 15, p. 148-155
dc.rights.uri info:eu-repo/semantics/openAccess
dc.source Kim, Y. H. Kim, S. Kakekhani, A. Park, J. Park, J. Lee, Y. H. Xu, H. Nagane, S. Wexler, R. B. Kim, D. H. Hyeon Jo, S. Martínez Sarti, Laura Tan, P. Sadhanala, A. Park, G. S. Kim, Y. W. Hu, B. Bolink, Henk Yoo, S. Friend, R. H. Rappe, A. M. Lee, T.W. 2021 Comprehensive defect suppression in perovskite nanocrystals for high-efficiency light-emitting diodes Nature Photonics 15 148 155
dc.subject Química
dc.title Comprehensive defect suppression in perovskite nanocrystals for high-efficiency light-emitting diodes
dc.type info:eu-repo/semantics/article
dc.date.updated 2021-04-28T09:01:55Z
dc.identifier.doi https://doi.org/10.1038/s41566-020-00732-4
dc.identifier.idgrec 143029

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