Optical analysis, optical limiting and electrical properties of novel PbI2/PVA polymeric nanocomposite films for electronic optoelectronic applications

This paper studied the influence of changing the lead iodide (PbI2), concentration in the PVA matrix through the structural, optical and electric measurements. Nanocomposite films have been defined by X-ray diffraction and FT-IR spectrometer which reveal the interaction between PVA and PbI2. The interplanar distance, particle size, and the average inter-crystalline separation were calculated. The optical properties of PbI2/PVA composites have been examined. PVA optical band gap was reduced from 5 to 3.49 in indirect transition and from 5.48 to 4.88 indirect transition to cause an increase in optical conductivity. Dielectric constant, epsilon(1) and dielectric loss, epsilon(2) and electrical conductivity, sigma is increased with increasing PbI2 concentrations. So, the electrical conductivity s can be controlled by the PbI2 doping percentage. PbI2/PVA showed laser power attenuation for both He-Ne and solid-state green laser beams. The results indicate that the nanocomposites are highly recommended in optoelectronic, radiation detection and many other applications.