I could clearly observe that opening the slit widths (any of excitation or emission slits) can intensify the luminescence line. However, I am not sure if it causes also other effects such as broadening or etc.... How one can measure a good signal (with acceptable signal to noise ratio) when the sample is not a good luminescent?
if the excitaion spectra is wide include all the excitation wavelength, slit widths have no effect on the emission spectra.
in fact, the emission comes from the luminescence centers with the different energy levels due to different local envrionment. broad slit can lead to all the luminsecence centers are excited and narrow slit only partion.
In addition, if the scene is not uniform, broad slit can create spurious spectral shift and line deformation.
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