scholarly journals Film Dichroism. III. Linearly-polarized Absorption Spectra of Highly Symmetric Triphenylmethane Dyes in the Stretched Poly(vinyl alcohol) Films

1979 ◽  
Vol 52 (8) ◽  
pp. 2244-2249 ◽  
Author(s):  
Yukio Matsuoka ◽  
Kiwamu Yamaoka
Keyword(s):  
Absorption Spectra ◽  
Vinyl Alcohol ◽  
Poly Vinyl Alcohol ◽  
Triphenylmethane Dyes ◽  
Linearly Polarized

Absorption spectra of CR3+ in poly(vinyl alcohol)

1991 ◽  
Vol 31 (3) ◽  
pp. 347-351 ◽  
Author(s):  
A.M. Hashad ◽  
A. Abdel Razik ◽  
Afkar K. Abdel Hadi
Keyword(s):  
Absorption Spectra ◽  
Vinyl Alcohol ◽  
Poly Vinyl Alcohol

scholarly journals Studying of the optical properties of poly (vinyl alcohol) films using Aluminum sulphate as additive by measuring allowed direct transition energy gap

2011 ◽  
Vol 8 (1) ◽  
pp. 103-109
Author(s):  
Baghdad Science Journal
Keyword(s):  
Activation Energy ◽  
Band Gap ◽  
Absorption Spectra ◽  
Vinyl Alcohol ◽  
Optical Band Gap ◽  
Energy Gap ◽  
Poly Vinyl Alcohol ◽  
Direct Transition ◽  
Aluminum Sulphate ◽  
Optical Activation

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.

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