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<p>PMMA composites containing a newly synthesized π-extended coumarin derivative, 2-oxo-3-(phenylcarbonyl)-2H-chromen-7-yl 4-methoxybenzoate (MBC), were systematically investigated to evaluate their optical and electronic properties across dopant loadings of 0, 2, 5, 10, and 100 wt%. UV–Vis analysis revealed a progressive redshift of the absorption edge with increasing concentration, attributed to π → π* and n → π* transitions, while all samples exhibited direct allowed electronic transitions. The optical band gap (E<sub>g</sub>) decreased from 4.394 to 3.215&#xa0;eV, confirming enhanced semiconducting character with increasing MBC content. Increasing dopant concentration improved the refractive index and reduced Urbach energy (E<sub>u</sub>), indicating reduced structural disorder and enhanced optical ordering. Dispersion parameters showed an overall decreasing trend, whereas oscillator wavelength increased with composition. Electrical conductivity (σ<sub>elect</sub>) increased significantly relative to pristine PMMA, while optical conductivity (σ<sub>optic</sub>) reached ~ 1.8 × 10<sup>12</sup>&#xa0;s<sup>−1</sup> at high loading. In addition, the volume and surface energy loss functions (VELF and SELF) exhibited systematic redshifts with increasing dopant concentration, with maxima near 3.14 and 3.18&#xa0;eV for pure MBC. These results suggest that MBC can serve as an effective functional dopant for tuning the optical and electronic properties of PMMA, suggesting its potential for optoelectronic applications.</p>

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Optical, electronic, and dispersion properties of PMMA composites: effect of a newly synthesized coumarin dopant with an extended π-system

  • 期刊论文

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  • 发表日期：

    2026年6月23日

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  • Adnan Kurt,
  • Murat Koca

摘要

PMMA composites containing a newly synthesized π-extended coumarin derivative, 2-oxo-3-(phenylcarbonyl)-2H-chromen-7-yl 4-methoxybenzoate (MBC), were systematically investigated to evaluate their optical and electronic properties across dopant loadings of 0, 2, 5, 10, and 100 wt%. UV–Vis analysis revealed a progressive redshift of the absorption edge with increasing concentration, attributed to π → π* and n → π* transitions, while all samples exhibited direct allowed electronic transitions. The optical band gap (Eg) decreased from 4.394 to 3.215 eV, confirming enhanced semiconducting character with increasing MBC content. Increasing dopant concentration improved the refractive index and reduced Urbach energy (Eu), indicating reduced structural disorder and enhanced optical ordering. Dispersion parameters showed an overall decreasing trend, whereas oscillator wavelength increased with composition. Electrical conductivity (σelect) increased significantly relative to pristine PMMA, while optical conductivity (σoptic) reached ~ 1.8 × 1012 s−1 at high loading. In addition, the volume and surface energy loss functions (VELF and SELF) exhibited systematic redshifts with increasing dopant concentration, with maxima near 3.14 and 3.18 eV for pure MBC. These results suggest that MBC can serve as an effective functional dopant for tuning the optical and electronic properties of PMMA, suggesting its potential for optoelectronic applications.