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. 2019 Feb 15;10:765. doi: 10.1038/s41467-019-08749-2

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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. 5 — The origin of charge modulation. a DC bias-dependent elecctro-absorption (EA) signal of the sample with a structure of ITO/blue (Cd_1−xZn_xS) QDs/Al. b DC bias-dependent EA signal of the sample with a structure of ITO/blue (Cd_1−xZn_xS) QDs/ZnO/Al. c DC bias-dependent EA signal of a standard red device which is measured before and after the lifetime test. d DC bias-dependent EA signal of a standard blue device which is measured before and after the lifetime test. The probing wavelength is 570 nm for red (Cd_1−xZn_xSe_1−yS_y) dots and 455 nm for blue (Cd_1−xZn_xS) dots. The straight lines are indicators of the linear relationship between signal strength and applied bias