APL008-3-7 Electronic Transitions of Polymethyl methacrylate (PMMA) Doped with Red Methyl Dye
Abstract
Thin films of pure poly(methyl methacrylate) (PMMA) and those doped with 2% red methyl dye were prepared using the spin- coating technique at room temperature. The optical properties of the films were investigated by recording their absorption and transmission spectra in the wavelength range of 300–900 nm. From the absorption spectra, the absorption coefficient (α) was calculated to evaluate the optical transitions within the material. Detailed analysis was carried out to estimate the optical bandgap energies corresponding to indirect allowed and indirect forbidden electronic transitions. The results reveal significant modifications in the optical behavior of the PMMA matrix due to the incorporation of the red methyl dye, indicating changes in electronic structure and light interaction. These findings are essential for understanding the tunability of PMMA-based composites for potential applications in optoelectronic devices and functional coatings.
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