Noncrystalline films of gallium (III) phthalocyanine chloride evaporated on a flexible polymer substrate for flexible organic technology: optical spectroscopy and optical limiting

Abstract

Thin films of thermally evaporated gallium-phthalocyanine dichloride (GaPcCl) on a flexible polymer substrate have been studied. Structural as well as spectral optical properties of these films were investigated at a different film thickness of 45, 75, 100, and 150 nm. The structure of GaPcCl/ polymer is found to be amorphous with a broad hump that is characterized by the polymer sheet. The absorption spectra recorded in the UV–vis region for these films showed two absorption bands, namely the Q- and B-bands. The absorption coefficient of the films has shown three indirect allowed transitions with energy gaps, which slightly changed with the effect of the thickness. The dispersion curve of the refractive index and the characterizing energy loss of high energy electrons such as volume energy loss function and surface energy loss function were calculated for the present films. The response of GaPcCl/polymer with different film thicknesses is studded by two types of laser with different input power as an optical limiter. The present results show that the response of GaPcCl films is highly reliable for the laser power attenuating of the green laser at 533 nm with low power of 16.3 mW. The result of GaPcCl/polymer can be extended to the optoelectronic devices.