Effect of Gamma radiation on structural and optical parameters of Sm2O3:Mn/PVA nanocomposite film

Nanocomposite Sm2O3:Mn/PVA films were prepared by sol-gel and casting methods. The influence of low Gamma-radiation doses (gamma-dose, 0-1000 Gy) on structural and optical characteristics of the Sm2O3:Mn/PVA nanocomposite was investigated by X-ray diffraction, scanning electron microscopy, UV-Vis. Spectrophotometry (200-1000 nm) and photoluminescence (550-750 nm at excitation of 360 nm) techniques. The UV absorption and transmittance spectra were affected by gamma-doses. The direct and indirect energies gaps were decreased while the refractive index was enhanced with increased gamma-doses. The effect of gamma-doses on the dispersion parameters were studied in details using UV spectra. The photoluminescence studies revealed that the nanocomposite emitted red color and its intensity diminished by increased gamma-doses, also the emitted peak shown a red shift with increasing of gamma-doses.