Fig. 6

a Characteristics of J-V-L for devices E (blue solid circle line) and F (red open square line). b CE-L-EQE curves of devices E (blue solid circle line) and F (red open square line). c EL spectra of devices E and F and the spectrum of sunlight measured by PR650. Blue line for device E, red line for device F, and violet dash line for sunlight. d Gauss multi-peaks fitting for the spectra of device E