Fig. 3
a Plot the absorption coefficient against time during bleaching of a 5 % IAB/APC film at 488 nm with an incident intensity of 82 μW/mm2. Inset: plot of the maximum change in the absorption coefficient at 488 nm against the 488-nm intensity. b Plot of the absorption coefficient against time for a 5 % IAB/APC film at 488 nm after the bleaching beam at 488 nm was switched off. c Plot of the absorption coefficient against time during bleaching and photodegradation of a 5 % IAB/APC film at 488 nm for an incident intensity of 38 mW/mm2. The bleaching beam was blocked after 27,550 s, and there is a small increase in the absorption coefficient that is more clearer in the inset