Open AccessStudying of the optical properties of poly (vinyl alcohol) films using Aluminum sulphate as additive by measuring allowed direct transition energy gap
Author(s) -
Atheel Alwash
Publication year - 2011
Publication title -
mağallaẗ baġdād li-l-ʿulūm
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.167
H-Index - 6
eISSN - 2411-7986
pISSN - 2078-8665
DOI - 10.21123/bsj.8.1.103-109
Subject(s) - vinyl alcohol , band gap , materials science , alcohol , absorption (acoustics) , aluminium , analytical chemistry (journal) , absorption spectroscopy , atmospheric temperature range , activation energy , doping , spectral line , optoelectronics , chemistry , optics , composite material , organic chemistry , polymer , physics , astronomy , meteorology
The change in the optical band gap and optical activation energy have been investigated for pure Poly (vinyl alcohol)and Poly (vinyl alcohol) doped with Aluminum sulphate to proper films from their optical absorption spectra. The absorption spectra were measured in the wave range from (200-700) nm at temperature range (25-140) 0C. The optical band gap (Eg) for allowed direct transition decrease with increase the concentration of Aluminum sulphate. The optical activation energy for allowed direct transition band gap was evaluated using Urbach- edges method. It was found that ?E increases with increasing the concentration of Al2 (SO4)3 and decreases when temperature increases.