Figure 6: Data collected for the determination of the temperature dependence of the singlet generation yield. (a) Show how the electrical characteristics of the devices change as a function of temperature which enables the optical output from the devices to be scaled to take into account changes in the electrical characteristics. (b) Show how the triplet-population (measured by the triplet induced absorption) changes strongly with temperature, and also how the delayed electroluminescence is greatly quenched at high temperatures.