Self-organized J aggregates of pseudoisocyanine dye in nanometer dimensions at the vicinity of a glass solution interface: a time-resolved and total-internal-reflection fluorescence spectroscopic study

Optical properties of newly observed J aggregates (J(L1) and J(L2)) for an aqueous pseudoisocyanine (PIC) dye solution produced in a soda lime wedge-t ype glass cell at room temperature were demonstrated. The absorption peaks of the aggregates were red-shifted (peak: J(LI)similar to 17 340 and J(L2)s imilar to 17 240 cm(-1)) compared to that of a well-known T aggregate (peak : similar to 17 480 cm(-1)), and their line widths were also broadened. Tim e-resolve and total-internal-reflection (TIR) fluorescence measurements sho wed that the J aggregates were distributed in a mesoscopic region at the gl ass/solution interface, and the aggregate/substrate interface in solution c ould act as a nonradiative channel for the excitonic state. (C) 1999 Elsevi er Science S.A. An rights reserved.