Investigation of the Qx -Qy Equilibrium in a Metal-Free Phthalocyanine.
Phthalocyanines (Pcs) have attracted a lot of interest as small molecules for organic electronics. However, some excited-state properties of metal-free phthalocyanines, as for example, the dynamics of the transition between the nondegenerate Qx and Qy states in a metal-free phthalocyanine, have not been fully established. This effect results in a blue-shifted shoulder with low intensity in the Pc fluorescence spectrum. This shoulder was suggested to be related to emission from the more energetic Qy state. By using ultrafast femtosecond transient absorption, we have found a clear equilibrium between the Qx and Qy state of metal-free phthalocyanines in solution.
Department of Chemistry, Division of Molecular Imaging and Photonics, KULeuven, Celestijnenlaan, 200F, Heverlee, Belgium.
Yannick
Y
Baeten
Department of Chemistry, Division of Molecular Imaging and Photonics, KULeuven, Celestijnenlaan, 200F, Heverlee, Belgium.
Eduard
E
Fron
Department of Chemistry, Laboratory of Polymer Chemistry, Université Libre de Bruxelles, Chimie des Polymères, CP 206/01, Campus de la Plaine, Brussels, Belgium.
Christian
C
Ruzié
Department of Chemistry, Laboratory of Polymer Chemistry, Université Libre de Bruxelles, Chimie des Polymères, CP 206/01, Campus de la Plaine, Brussels, Belgium.
Yves Henri
YH
Geerts
Department of Chemistry, Division of Molecular Imaging and Photonics, KULeuven, Celestijnenlaan, 200F, Heverlee, Belgium. mark.vanderauweraer@chem.kuleuven.be.
Mark
http://orcid.org/0000-0002-9022-1696
M
Van Der Auweraer
chromophores; fluorescence spectroscopy; photophysics; phthalocyanines; pump probe