  The spectrophotometric characterization of high efficiency, optically-active
samples such as light-emitting organic bulks and thin films can be problematic
because their broad-band luminescence is detected together with the
monochromatic transmitted and reflected signals, hence perturbing measurements
of optical transmittance and reflectance at wavelengths within the
photoexcitation band. As a matter of fact, most commercial spectrophotometers
apply spectral filtering before the light beam reaches the sample, not after
it. In this Report, we introduce and discuss the method we have developed to
correct photometric spectra that are perturbed by photoluminescence.
