Optical properties of BaCl2 doped poly (vinyl alcohol) films

Abstract

The effects of BaCl2 dopant on the optical properties of poly (vinyl alcohol) have been investigated. Pure and BaCl2 doped PVA films were prepared using solvent casting method. These films were characterized using UV/VIS technique in order to estimate the kind of transition which was found to be indirect transition. The value of the optical energy gap was decrease with increasing dopant concentration. Refractive index, extinction coefficient and Urbach tail have been also investigated; it was found that all the above parameters affects by doping.