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. 2015 May 14;6:7149. doi: 10.1038/ncomms8149

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(a) Optical images of the flexible white QLEDs under the bias. (b) Magnified view (PL image) of the RGB QD pixels of white QLEDs. (c) Energy band diagram of white QLEDs estimated by the ultraviolet photoelectron spectrometry. (d) EL spectra of PWQLEDs and each monochromatic (R, G and B) QLED. (e) CIE 1931 x–y chromaticity diagram showing the true-white colour (0.39, 0.38) of PWQLEDs. (f) Brightness versus voltage of PWQLEDs and MWQLEDs. PWQLEDs show the higher efficiency than MWQLEDs, particularly at the high brightness. (g) External quantum efficiency of PWQLEDs and MWQLEDs. (h) Electrical properties (J–V characteristics) at different bending angles. (i–k) Time-resolved PL spectra of aligned RGB (PWQLED), mixed (MWQLED), and monochromatic (R, G and B) QD layers.