Tunable optoelectronic matter is required to generate next-generation devices that involve adjustable light and
electricity exchanges. By altering material’s properties, such as absorption, researchers can attain more effective
materials that can be suitable candidate for optoelectronic applications. Polycarbonate (PC), polyethylene oxide
(PEO), poly (methyl methacrylate) (PMMA) and Chromium oxide (Cr2O3) nanoparticles (NP) were utilized to
fabricate PC/PEO/PMMA/Cr2O3 nanocomposite (NC). The Cr2O3 NPs were synthesized via the sol gel method;
the average particle size is19.73 ± 0.49 nm, as indicated from the profex refinement of the XRD scans. Samples
from the synthesized NC membranes were exposed to γ ray doses from 20 to 120 kGy. Fourier transform infrared
(FTIR) and UV–vis spectroscopies were carried out to realize the outcomes of the impact of γ radiation on the
structural and optical properties of the NC membranes. The influence of the γ radiation on the light absorbance,
refractive index, extinction coefficient, optical conductivity, Urbach energy and optical bandgaps of the PC/PEO/
PMMA/Cr2O3 NC membranes was studied. The absorbance of the NC membranes increased as they were exposed
to γ doses up to 120 kGy. The improvement in absorbance was associated with a reduction in both direct and
indirect bandgaps. A decrease from 4.48 to 4.28 eV for direct, and from 2.72 to 2.20 for indirect transitions has
been observed. At the same time, an increase of Urbach energy from 0.16 to 0.51 eV was observed. Also, the
optical dielectric loss (ε”) was utilized for the identification of the type of microelectronic transitions for the PC/
PEO/PMMA/Cr2O3 NC membranes, which was recognized to be a direct allowed transition. Additionally, both
the refractive index and optical conductivity increased with increasing dose up to 120 kGy. Moreover, the color
intensity (ΔE) which is the color differences between the irradiated and non-irradiated samples were calculated
using the International Commission on Illumination (CIE) color differences technique. The results indicated
significant color difference as ΔE reached 37 (>5). The perceived modifications in optical properties of the PC/
PEO/PMMA/Cr2O3 NC highlight the possibility of utilizing it in optoelectronic applications