Fig. 6: EL characteristics of PeLEDs.

a Device structure of PeLEDs. b Current density of PeLEDs as a function of applied voltage. c Luminance of PeLEDs as a function of applied voltage. d External quantum efficiency (EQE) of PeLED as a function of applied voltage. e Current efficiency (CE) of PeLEDs as a function of applied voltage. f Normalized EL spectra of PeLEDs.