Effect of Alizarin red S on the optical and fluorescence properties of PVA films for photonic applications

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Abstract
In this study, the influence of Alizarin red S (ARS) doping on the optical and fluorescence properties of polyvinyl alcohol (PVA) was systematically investigated. Pure PVA and ARS-doped PVA composite films were prepared using the solution-casting technique. Fourier transform infrared analysis confirmed the formation of chemical interactions between PVA and ARS molecules. UV–Visible absorption spectra displayed enhanced absorbance in the UV region along with a red shift in the absorption edge, indicates the reduction in the optical band gap and an increase in activation energy. The XRD results demonstrates that the modifications in the structural behaviour of PVA upon incorporation of dye concentrations and these modifications are also changes the surface morphology and good dye–polymer compatibility as reflected from SEM studies. Thermal analysis showed that the thermal stability of PVA was improved upon ARS doping. Fluorescence spectroscopy (excitation at 260 nm) revealed a progressive decrease in emission intensity with increasing ARS concentration, indicating the concentration dependent quenching dominated by non-radiative dipole-dipole energy transfer. The observed reduction in fluorescence polarization and anisotropy was attributed to an enhancement of rotational mobility of ARS molecules within the PVA matrix.

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