145012.fig.008a
(a)
145012.fig.008b
(b)
Figure 8: (a) Room temperature EL spectra measured at different drive currents using 1 kHz and 50% duty cycle. (b) Measured output power at room temperature. The inset shows the data on a log-log scale. The lines correspond to the gradients from which the values of 𝑍 are extracted.