Concentration dependence of the gain spectrum in energy‐transfer dye mixtures

摘要

Acceptor concentration dependence of the gain‐spectrum peak was measured in coumarin 30 (donor) and rhodamine 6G (acceptor) mixtures. Change of the gain spectrum due to the energy‐transfer reaction is attributed to the change of the effective fluorescence lifetime. From the concentration dependence of the effective fluorescence lifetime, rate constants were obtained as follows: kda (for resonance energy transfer) =4×10-11 cm3/sec and k′da (for radiative energy transfer) =2×10-9 cm3/sec. Consequently, the radiative energy transfer was the most dominant mechanism in the energy‐transfer reaction.