Linear and nonlinear optical properties of nano-spherical Perylenetetracarboxylic dianhydride/ITO as a new optical system

In the current work, the thermal evaporation method was used to deposit the Perylenetetracarboxylic dianhydride (PTCDA) into conductive glass titled (ITO glass) as a new trend in the optical spectroscopy nowadays. X-Ray Diffraction (XRD) was evidenced that the PTCDA/ITO thin film has had a nanostructural characteristic, and the crystalline part of the film oriented with (1 0 2) plane. Atomic Force Microscopes (AFM) was definite that the morphology containing nano-spherical particles. The absorption spectra were examined in the UV–Vis-NIR regions and determined the significant parameters such as molar extinction coefficient ε_molar, oscillator strength ƒ electric dipole strength q² and optical energy gap. The linear optical constant; extinction coefficient, (k), and refractive index (n) were measured using spectrophotometric measurements in the wavelength range 300–2500 nm. The real part and imaginary parts of the dielectric constant and optical conductivity were evaluated and discussed. The third order non-linear susceptibility, χ⁽³⁾ and nonlinear refractive n⁽²⁾ were estimated based on generalized Miller's rule and linear refractive index at photon energy from 0.5 to 4 eV. All possible linear and nonlinear parameters are reported for using this material in OLED devices. PTCDA is a promising organic semiconductor for wide-scale application in organic devices and engineering.