Effect of rare earth doped perovskite on the structural, linear/nonlinear optical properties of the fabricated PVA/CMC polymeric blends for optical limiting applications

Abstract

Poly (vinyl alcohol) and carboxy methyl cellulose, PVA/CMC doped with (1, 5,8) Wt% of Lanthanum Dysprosium aluminate (LaDyAlO3) nanoparticles were prepared via traditional solution casting method. The influence of the concentration of LaDyAlO3 nanoparticles on optical and spectroscopic properties was investigated. The molecular and the crystalline structure of PVA/CMC/LaDyAlO3 polymer nanocomposites were obtained through the Fourier transform infrared (FTIR) spectroscopy and X-ray diffraction (XRD). The optical characteristics were investigated via UV–Visible spectrophotometer. For all samples, the absorption coefficient was determined. The direct and indirect allowed transitions have a multi graded bandgap structure. The thermal stability was investigated and the activation energy was determined which is found to be dependent on the concentration of LaDyAlO3 nanoparticles. Furthermore, the PVA/CMC/LaDyAlO3 (5 wt%) demonstrated excellent optical limiting threshold properties at low transmission value which is a favorable result for optoelectronic devices like optical limiters, long-lasting optical filters and photonic devices like organic/Polymer LEDs, Optical switches and perovskite solar cells. Also the Reverse saturable absorption is transformed to Saturable absorption for PVA/CMC/LaDyAlO3 (8 wt%) which makes it applicable for saturable absorbers and optical switches and many others etc.