Abstract
Abstract The effect of the laser intensity on fluorescence line-narrowing (FLN) spectra of tetracene in polymer and glassy matrices has been studied. For excitation use has been made of the 457.9 nm and 476.5 nm lines of an argon-ion laser, which have significantly narrower bandwidths than the homogeneous spectral transitions involved. It appears that at relatively low intensities, in the order of 1 mW/mm2, already nonlinear absorption effects become visible in the spectrum when excitation in transitions with relatively large absorption cross-sections is applied. This is for instance the case when the 0-0 transition of the molecule is probed. The analytical implications of these saturation effects have been discussed.
Published Version
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