Fig. 4: Device structure and performance of QLEDs. | Nature Communications

Fig. 4: Device structure and performance of QLEDs.

From: Highly efficient and eco-friendly green quantum dot light-emitting diodes through interfacial potential grading

Fig. 4

a Device architecture of the green QLED. b Current density-voltage-luminance characteristics of the green QLEDs based on control and IPG QDs. c Two-dimensional (2D) map of drive-voltage-dependent EL spectra of IPG QLED. The photo of operating device is shown in inset with a pixel size of 4 mm2. d Corresponding EQE-luminance characteristics (inset: summary of the reported ZnSeTe green QLEDs performance on the basis of maximum EQE and the corresponding luminance). e Histograms of the peak EQEs for control and IPG QDs, each measured with over 60 devices. f Operational stability of QLEDs under constant current of 1.22 mA for IPG and control QLEDs.

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