External Electric Field Effect on Fluorescence Spectra
of Pyrene in Solution
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Abstract
Electrophotoluminescence
(E-PL) spectra, i.e., plots of the electric-field-induced change in
photoluminescence intensity as a function of wavenumber, have been
measured for pyrene solution. At high concentrations of pyrene where
excimer fluorescence is observed along with the monomer fluorescence
emitted from the locally excited state, both excimer fluorescence
and monomer fluorescence are enhanced by application of electric fields.
The results show that the nonradiative decay process at the excimer
emitting state is decelerated by application of electric fields. It
is also found that molecular polarizability of pyrene excimer is larger
than that of pyrene monomer in the ground state by ∼270 ±
90 Å<sup>3</sup>, based on the analysis of the Stark shift of
the excimer fluorescence