title: The lifetime and efficiency of triplet-triplet fluorescence from the excited state of a TMM biradical determined using transient emission spectroscopy by two-color two-laser flash photolysis.
abstract: The single laser flash photolysis (FP) of 2-(4-benzoylphenyl)-2-phenyl-1-methylenecyclopropane gave rise to a ground state trimethylenemethane (TMM) biradical with absorption bands at 362 and 545 nm and an excited state of this biradical that displays triplet-triplet fluorescence at 580 nm. The excited biradical is likely formed via an expected two-photon process as well as an unexpected one-photon process. The fluorescence quantum yield of the excited biradical, 0.021, was successfully determined by employing a two-color two-laser FP technique.
authors.affiliation: Department of Applied Chemistry, Graduate School of Engineering, Osaka Prefecture University, Sakai, Osaka, Japan.
authors.forename: Yasunori
authors.initials: Y
authors.lastname: Matsui
authors.forename: Daisuke
authors.initials: D
authors.lastname: Kawahara
authors.forename: Eisuke
authors.initials: E
authors.lastname: Ohta
authors.forename: Hiroshi
authors.initials: H
authors.lastname: Ikeda