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. 2018 Aug 1;7:46. doi: 10.1038/s41377-018-0046-5

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© The Author(s) 2018

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 — a Plots of luminance as a function of frequency. b Current–frequency characteristics of AC-OEL devices and effective current analysis. c Electroluminescence (EL) spectral shifts of AC-OEL devices with driving frequencies of 50; 100; 500; 1000; 10,000; 20,000; 30,000; 40,000; 50,000; and 60,000 Hz. d Images of the color-tuning emission in the forward and reverse frequency sweeps. e CIE 1931 x–y chromaticity diagram, which shows the color shift from (0.23, 0.34) to (0.53, 0.40) with frequency variation between 50 and 60,000 Hz