Time resolved response of luminescence on cyanine dye J‐aggregates

Abstract On aqueous solution of cyanine dye J‐aggregates, time‐resolved response of upconverted luminescence was re‐investigated. The rise and decay time parameters were estimated to 3 and 200 ps by curve‐fitting technique in spite of excitation energy. The excitation energy dependence of upconverted luminescence was measured for aqueous solution. The peak energy and line shape of the spectra are independent from the excitation energy. The peak intensities change exponentially depending on the excitation energy. (© 2006 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)