Influence of γ-irradiation on optical properties of manganese phthalocyanine thin films

The optical absorption of thermally evaporated MnPc thin film has been studied in the UV–vis region. The absorption spectra for the as-deposited and irradiated films showed two well-defined absorption bands of phthalocyanine molecule, namely the Q-band and Soret band (B). The optical properties of thermally evaporated manganese phthalocyanine thin films were characterized using spectrophotometric measurements of transmittance and reflectance at normal incidence of light in the wavelengths range 200–2500 nm. The refractive index (n) and the absorption index (k) were calculated. The effects of γ-irradiation on the optical properties were investigated for dosimetry applications. The values of the optical band gap Eopt, the transport gap and the dispersion parameters for as-deposited and irradiated films with different doses of γ-irradiation were also estimated and discussed.