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. 2019 Mar 4;10:1027. doi: 10.1038/s41467-019-09011-5

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© The Author(s) 2019

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/.

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Fig. 3 — Performance of CsPbCl_0.9Br_2.1 perovskite light-emitting diodes (LEDs) with different ratios of phenylethylammonium bromide (PEABr). a Perovskite LED architecture and energy level diagram for different layers of the device. b Characterization of current density and luminance versus voltage. The solid lines and lines with dots correspond to the luminance and the current density, respectively. c Characterization of external quantum efficiency (EQE) versus current density. d Electroluminescence (EL) spectra of perovskite LEDs. e Commission Internationale de l’Eclairage (CIE) values of the EL spectra of perovskite LEDs