Figure 8

Comparison of the normalized PL and IOT spectra performed at low T for the coumarin-6 polycrystalline films deposited at T_sub = (a) 125, (b) 150 and (c) 169 °C with T_sou = 185 °C. The schematic energy-term diagrams on the right-side summarize the corresponding transitions for E_op and for the four PL peaks.