Abstract
The work aims to study the effect of varying the concentrations on the optical properties of the organic copper phthalocyanine pigment before and after exposure to a laser beam of different wavelengths . The pigment was dissolved in chloroform solvent at room temperature and in several concentrations . The optical properties including the spectrum of absorbance, transmittance, and reflectivity are measured. The work also presents the energy gap data that was calculated from the Tauc equation for all concentrations. The results showed that the band gap decreases with increasing solution concentration. The band gap is measured using both Tauc and fluorescence method, and the values are compared at concentration . The optical parameters such as absorption coefficient, extinction coefficients, refractive index, dielectric constants, and optical conductivity are increased with increasing laser time irradiation for all solution concentrations.
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