Abstract
The fluorescence decay curves of 4-dimethylaminobenzonitrile (DMABN) in different polar protic and aprotic polymer matrices are nonexponential. The lifetimes of the twisted intramolecular charge transfer (TICT) band are in the nanosecond range. With nanosecond time-resolved fluorescence spectroscopy dual fluorescence was observed for DMABN in a poly (vinyl alcohol) (PVA) polymer matrix at room temperature. These observations contradict results obtained by Cazeau-Dubroca and coworkers who report lifetimes of the TICT band of DMABN in PVA polymer matrices of the order of 1 s and claim the emission is an α-delayed fluorescence. Free volume effects are shown with 1,1,4,4-tetraphenylbutadiene (TPB) in PVA matrices.
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