Fig. 4
From: On the degradation mechanisms of quantum-dot light-emitting diodes
The quantum-dot–ZnO junction. a Electro-absorption (EA) spectra (in-phase and quadrature) of the sample with a structure of ITO/red (Cd1−xZnxSe1−ySy) quantum dots (QDs)/Al. b EA spectra (in-phase and quadrature) of the sample with a structure of ITO/red (Cd1−xZnxSe1−ySy) QDs/ZnO/Al. c EA spectra (in-phase and quadrature) of the sample with a structure of ITO/blue (Cd1−xZnxS) QDs/Al. d EA spectra (in-phase and quadrature) of the sample with a structure of ITO/blue (Cd1−xZnxS) QDs/ZnO/Al. The spectra are obtained using a DC bias of −1 V, AC amplitude of 0.1 V. Arrows mark the wavelength at which in-phase signal reaches zero and they also match excitonic peaks in linear spectra (Supplementary Fig. 1). Relevant discussion is detailed in Supplementary Note 4
