Abstract
Electric field effects on absorption and emission spectra and emission decay have been examined for tris(8-hydroxyquinoline)aluminum (Alq 3) doped in a poly(methyl methacrylate) film. Emission spectra as well as absorption spectra of Alq 3 exhibit the so-called Stark shift in the presence of external electric field, and a significant change in electric dipole moment takes place following the optical transition. Fluorescence of Alq 3 also shows the electric-field-induced quenching, which is confirmed to originate from the field-induced increase in intramolecular non-radiative decay at the emitting state by the direct measurements of the field-induced change in fluorescence decay profile.
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