Figure 3
PL and EL spectra of ZnPc films excited at 532 nm and temperature-dependent behaviors of the PL.
(a) PL spectra of pristine ZnPc (black line) and WEG ZnPc (red line) films in comparison with the EL spectrum of a WEG ZnPc film (purple line) and the assigned interband transition peak (blue filled peak). (b) Peak positions of the PL of pristine ZnPc (black squares) and WEG ZnPc (red squares) films under different temperatures. (c) Fitting the high-energy slopes of PL spectra of a WEG ZnPc film under different temperatures to Boltzmann distributions. (d) The fitted effective electron temperatures of pristine ZnPc (black squares) and WEG ZnPc (red squares) films. The red solid line represents a linear fitting with a slope of 0.92 and an intercept of 106.8 K.
