Abeer D.  Adaileh, 
    Optical Properties of ZnO/PVC Composites,
    Journal of Engineering and Applied Sciences,
    Volume 14,Issue 4,
    2019,
    Pages 1198-1202,
    ISSN 1816-949x,
    jeasci.2019.1198.1202,
    (https://makhillpublications.co/view-article.php?doi=jeasci.2019.1198.1202)
    Abstract: The optical properties of prepared ZnO/PVC composites with different concentration: 0, 2, 6,
9 wt.% of ZnO have been investigated. The optical spectra were obtained in the UV wavelength range
(400-800 nm) using a spectrophotometer. The absorption coefficient and the optical Energy gap (E<sub>opt</sub>) have been opt
obtained from indirect allowed electron transitions in k-space at room temperature. The tail widths of localized
states in the band gap (E) were evaluated using the Urbach-edges method. It was found that both E and E<sub>opt</sub> vary with the concentration of ZnO in the composite.
    Keywords: ZnO;PVC;composites;absorption;energy gap;transitions