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 epsilon(molar), oscillator strength f, electric dipole strength q(2) 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, chi((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. (C) 2018 Elsevier Ltd. All rights reserved.