Energy transfer and photodegradation of Perylene Red with DTTC and HITC acceptor dyes in PMMA

Energy transfer from Perylene Red to 1,1′,3,3,3′,3′-hexamethylindoletricarbocyanine iodide and 3,3′-diethylthiatricarbocyanine iodide in poly(methyl methacrylate) was investigated by monitoring the extent of fluorescence following irradiation with light of 532 nm. The measurements yielded information about the enhancement of HITC fluorescence induced by the dye, the energy transfer efficiency from the dye to HITC and the relative stability of the fluorescence of dye/HITC (DTTC)/PMMA films. The results of this study have important implications for near-IR emitting energy transfer dye lasers.