Review Article

Singlet Generation from Triplet Excitons in Fluorescent Organic Light-Emitting Diodes

Figure 8

Delayed electroluminescence after glow as a function of device ageing showing both the 35% contribution of delayed fluorescence to the total EL output and the loss of the DF with device age. implies that the devices has been run until its output has fallen to 60% of its initial light output.
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