ENERGY-TRANSFER BETWEEN J-AGGREGATES OF QUINOCYANINE DYES IN THE SODIUM ALGINATE FILMS

New optical materials such as the J-aggregate of quinocyanine dyes in polymer films were fabricated and studied. 1,1'-diethyl-2,2'-cyanine c hloride and iodide (dye I, X = Cl or I); as well as 5,6,5',6'-dibenzo- 1,1'-diethyl-2,2'-cyanine chloride (dye II) in the sodium alginate (SA ) films easily formed the J-aggregate, characterized by a sharp absorp tion of the J-band and the resonance fluorescence. The evidence of lon g distance energy transfer between extended donor and extended accepto r J-aggregates was presented. The critical distance of the energy tran sfer of about 55 Angstrom was estimated on the base of spectral and fl uorescence lifetime measurements.