Polymer-dispersed perylene di-imide dye photodegradation is investigated by monitoring the fluorescence intensity as a function of 532\text{\hspace{0.17em} nm} laser pulses. Anaerobically irradiated polymer–dye films exhibited an accelerated decrease in fluorescence intensity, which was partially recovered upon exposure to oxygen. Decelerated photodegradation rates were observed for perylene di-imide ethanol solutions upon the addition of a singlet oxygen quenching antioxidant. These observations suggest reversible photoreduction and type II photo-oxidation as important photodegradation mechanisms. Type II photo-oxidation for perylene red 532\text{\hspace{0.17em} nm} irradiation is supported by a singlet oxygen quantum yield of 0.09\pm 0.03 , determined via detection of time-resolved {\text{O}}_{\text{2}}\left(a^1{\mathrm{\Delta }}_g\to X^3{\sum }_g^{-}\right) infrared phosphorescence.

© 2006 Optical Society of America

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