Fig. 5: EL performance of CsPbBr₃ NPL based PeLEDs.

a Schematic illustration of the device architecture. b Cross-sectional SEM image of the PeLED. c Two-dimensional plot of the EL spectra under varying driving voltages. d Current density-voltage-luminance characteristics. e EQE versus current density for PeLEDs. The inset shows a photo of the PeLED at a voltage of 7.5 V. f Comparison of EQE versus CIE-y values for representative blue PeLEDs^{3,8,23,30,42,44,46,47,48,49,50,51,52,53}