Abstract
•Pyronin Y/flexible substrate thin films of different thicknesses are deposited by low cost/spin coating system.•XRD supports the amorphous structure of the studied pyronin Y.•The band gap was calculated for the PY/polymer system.•Nonlinear parameters are calculated by spectrophotometric data by semi-empirical formulas and interpreted.•Pyronin Y is a promising organic semiconductor technology.
Pyronin Y (PY) thin films of different thicknesses were deposited on a flexible polyacetate substrate by using the spin-coating method. Pyronin Y thin films have an amorphous structure as identified by X-ray diffraction method. The linear and nonlinear optical properties of PY thin films were studied in details as a function of wavelengths. Transmittance, absorbance and reflectance spectra of pyronin Y thin films were recorded in the wavelengths range from 300 to 2500nm. The refractive and absorption indices have been computed from Fresnel’s equation. The optical band gaps were calculated for the studied PY thin film of thicknesses 205, 140 and 95nm. Both direct and indirect gaps were computed as a function of PY of different thicknesses. The dielectric constant, dielectric loss and dissipation factor were investigated for the studied material. Spectrophotometric data was used to determine the nonlinear refractive index and the third nonlinear optical susceptibility. Pyronin Y thin films/polymer flexible substrate can be used in many applications such as flexible optoelectronic/electronic devices and for nonlinear optics with specified band gap.