Synthesis And Characterization of PVA CMC Blend with Rare Earth Doped Lanthanum Aluminate for Optoelectronic Applications

Abstract

Laser plays a significant role of mankind in the modern era since their major contributions in arena of communication, medicine, space and military sciences. Since laser exhibits higher fluence they can damage the sensitive optical components and even the human tissues. Therefore, as like engineering new and requirement-based laser sources, there is a high need to develop efficient laser protecting materials. Materials has to be nonlinear optical active in order to be utilized against the lasers for protection. Therefore, there are various phenomena of material science, spectroscopic diagnostics and physics of optoelectronics are used to deal with optical limiting applications. The effective nonlinear optical property with physiochemical stability is the main criteria of a device-grade optical limiter-an-endeavour to satisfy such desire needs Organic-Inorganic clusters. The inorganic nanofillers integrated within the polymer host matrix induces thermal stability, introduces increased levels of energy hierarchy, that results in improved optical nonlinearity that arose from organic counterpart. Of such species the nanofillers of Lanthanum aluminate and its corresponding cationic substitution with rare earth materials like Dysprosium, Samarium, Neodymium and Praseodymium are integrated into the host polymer blend of PVA/CMC at various concentrations like 1, 5 and 8wt% via the technique of solvent casting technique. Various film casting parameters were optimized in order to produce the nanocomposite films. The synthesized materials were investigated on optical, structural, thermal, morphological, emission and nonlinear optical properties in order to analyse their suitability for device construction. The nonlinear absorption coefficient (and#946;) and the Optical Limiting Threshold (OLT) were calculated for all the PVA/CMC/LaAlO3 and PVA/CMC/LaxAlO3 (X=Dy, Sm, Nd and Pr) films for the first time. The optical limiting characteristics of the nanocomposite films were investigated via the Pulsed nanosecond laser of excita