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. 2017 Nov 17;6(11):e17094. doi: 10.1038/lsa.2017.94

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Copyright © 2017 The Author(s)

This work is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by-nc-sa/4.0/

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Electroluminescence spectra and the CIE 1931 color space chromaticity coordinates of the three color-tunable OLED devices. (a–c) EL spectrum of the tandem OLED cells with material combinations of green–blue a, red–blue b and red–green c operated by applying an AC signal (100 Hz) with different pulse offsets. (d) CIE coordinates of the three color-tunable devices calculated from their EL spectra in a–c.