The luminescence spectra of films obtained by drop-casting from acetonitrile solutions on quartz slides were recorded at room temperature using a Fluorolog-3, Horiba JobinYvon spectrofluorimeter equipped with double-grating monochromator in both the excitation and emission sides. A 450 W Xe arc lamp and an R928P Hamamatsu photomultiplier were employed as excitation source and detector, respectively. The emission spectra were corrected for detection and optical spectral response of the spectrofluorimeter supplied by the manufacturer.
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