Abstract
Effects of low-intensity UV treatment on the optical constants of red BS dye-doped polymethyl methacrylate (PMMA) film including refractive index, extinction coefficient, real and imaginary parts of dielectric constant, band gap energy, Urbach energy, and refractive index dispersion parameters are measured and calculated. Changes in optical constants mainly occurred in the UV–VIS range. Red BS dye, which is used as a UV absorber impurity in PMMA films, generated another energy band gap which was increased by UV treatment. Although some of the optical constants of PMMA are not changed noticeably by the treatment in this low range of UV radiation, our results confirm that polymeric changes such as chain scission and depolymerization can directly affect the optical constants of PMMA.
Highlights
Poly(methyl methacrylate) (PMMA) is one of the best organic optical materials widely used to make a variety of optical devices, such as optical lenses
Red BS dye, which is used as a UV absorber impurity in polymethyl methacrylate (PMMA) films, generated another energy band gap which was increased by UV treatment
Some of the optical constants of PMMA are not changed noticeably by the treatment in this low range of UV radiation, our results confirm that polymeric changes such as chain scission and depolymerization can directly affect the optical constants of PMMA
Summary
Poly(methyl methacrylate) (PMMA) is one of the best organic optical materials widely used to make a variety of optical devices, such as optical lenses. Organic compounds contained in polymer films, even in trace amounts, affect the reactions occurring during irradiation. They can act as sensitizers or initiators of polymer photodegradation, or sometimes stabilize the system. The effect of UV radiation on the optical properties of red BS dye-doped PMMA film is studied experimentally. Optical spectra are analyzed to determine optical constants such as refractive index, extinction coefficient, dielectric constant and optical conductivity. Urbach energy and the nature of transition are determined using optical absorption spectra. It is possible to determine the indirect and direct transition occurring in the band gap of the sample by optical absorption spectra. The third section is devoted to the ‘‘Results and discussion’’ and the ‘‘Conclusion’’ is presented in the final section
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