Dispersion parameters, optical constant and photoluminescence of poly vinyl alcohol grafted eosin–Y Dye (PVA-g-Ei)‎

Abstract EN

Optical properties of PVA-g-Ei thin film prepared by cast method have been studied in spectral range of (200-900 nm) .The dispersion of the refractive index is discussed in term of Wlemple - DiDomenico single oscillator model , many dispersion parameters such as single oscillator energy (Eo ), dispersion energy ( Ed ), refractive index ( n(0) ), discussed using Miller’s rule ,the optical absorption at the fundamental absorption edge dielectric constant ( e¥ ) ,moment of the dielectric constant optical spectrum( M-1 ,M-3 )and energy gap by Wimple-DiDomenico approximation ( WDD g E )have been calculated,non linear optical susceptibility ( c (3) ) has been discussed , direct energy gap by Tauc relation ( T g E ), energy gap by absorption spectrum ( A g E ) and Urbach energy of the localized states (Eu ) were also calculated .

Photoluminescence spectrum of investigated PVA-g-Ei thin film has been recorded in spectral range of (500-700 nm) , photoluminescence quantum yield(FPL) and the energy gap at the absorption peak ( PL g E ) have been also determined .