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Abstract— Photophysical properties of coumarin dyes solubilized in aqueous detergent solutions have been investigated including measurement of absorption and fluorescence emission maxima, and fluorescence quantum yields. Use of coumarin 4 as a fluorescence probe of sodium dodecyl sulfate (SDS) and cetyltrimethylammonium bromide (CTAB) solutions led to the conclusion that the sites for dye incorporation in micelles are significantly hydrogen‐bonded (hydrated). The inhibition of photochemical decomposition for detergent‐solubilizcd dyes has also been observed. Electron transfer from micelle‐bound dye to a water soluble acceptor, methyl viologen, has been investigated by flash photolysis.