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Fluorescence spectra of the monomer, dimer and trimer of a ladder-type para-phenylene with perfectly planarized π-systems as well as of a phenylenevinylene oligomer with five phenylene units (OPV(5)) have been recorded employing the site selection technique. The spectra of the former compounds, embedded in a 6 K MTHF glass, show zero-phonon lines associated with the various vibronic features built...