Extended Data Fig. 8: Analysis of double-EML devices.
From: Efficient and stable blue quantum dot light-emitting diode
a–c, Voltage-dependent electroluminescence spectra of QD-LEDs with double EML, consisting of a C/S/S top layer with red-emitting InP/ZnSe/ZnS QDs and different bottom EMLs: C/S/S (a), C/S/S-Cl(l) (b) and C/S/S-Cl(f) (c). The insets show electroluminescence spectra at low voltages. d, Complex modulus spectra measured at various voltages before and after the T50 lifetime test for QD-LEDs with C/S/S-Cl(f). The real (horizontal axis) and imaginary (vertical axis) moduli were calculated using the equation M = iωZ, where i is the imaginary unit, ω is the frequency and Z is the complex impedance29. The grey arrow shows the direction of increasing frequency.
