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<p>This work demonstrates the simple, economical, and rapid synthesis of magnesia oxide (Mn<sub>2</sub>O<sub>3</sub>), copper oxide (CuO), and their compound Mn<sub>2</sub>O<sub>3</sub>/CuO composite, employing fundamental green practices. The as-synthesized Mn<sub>2</sub>O<sub>3</sub>, CuO, and Mn<sub>2</sub>O<sub>3</sub>/CuO have been evaluated using X-ray diffraction (XRD), high-resolution transmission electron microscopy (HRTEM), and field-emission scanning electron microscopy (FESEM). The presence of distinct Mn<sub>2</sub>O<sub>3</sub> and CuO phases, as well as the interphase between them, is evident in the TEM micrographs. Using the Tauc plot from absorption spectra, the energy bandgaps of pure Mn<sub>2</sub>O<sub>3</sub>, CuO, and the Mn<sub>2</sub>O<sub>3</sub>/CuO composite were estimated to be 2.6, 2.1, and 3.2&#xa0;eV, respectively. The obtained materials were investigated for their photoluminescence (PL) and chromaticity characteristics to understand interfacial charge-transfer behavior. The PL spectra reveal broad blue - green emissions with main peaks located at 414 –437&#xa0;nm for Mn<sub>2</sub>O<sub>3</sub>, 414 –439&#xa0;nm for CuO, and a slightly red-shifted, intensified band at 435&#xa0;nm for the Mn<sub>2</sub>O<sub>3</sub>/CuO composite. The corresponding CIE 1931 chromaticity coordinates (x ≈ 0.31, y ≈ 0.58) confirm a vivid green emission region, indicating improved color purity and radiative efficiency. These results demonstrate that coupling Mn<sub>2</sub>O<sub>3</sub> with CuO tailors the electronic band alignment, suppresses non-radiative losses, and promotes strong visible luminescence, making the Mn<sub>2</sub>O<sub>3</sub>/CuO nanocomposite a promising candidate for green light - emitting and optoelectronic devices.</p>

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Synergistic effects in Mn2O3/CuO nanocomposites for enhanced and color-tunable emission for optoelectronic applications

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年2月3日

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  • Vangapandu Anusha,
  • Akumarti Raju,
  • Budithi Ravi Kumar,
  • Gattupalli Manikya Rao,
  • K. Samatha,
  • Naresh Kumar Rotte,
  • Kasinathan Kaviyarasu

摘要

This work demonstrates the simple, economical, and rapid synthesis of magnesia oxide (Mn2O3), copper oxide (CuO), and their compound Mn2O3/CuO composite, employing fundamental green practices. The as-synthesized Mn2O3, CuO, and Mn2O3/CuO have been evaluated using X-ray diffraction (XRD), high-resolution transmission electron microscopy (HRTEM), and field-emission scanning electron microscopy (FESEM). The presence of distinct Mn2O3 and CuO phases, as well as the interphase between them, is evident in the TEM micrographs. Using the Tauc plot from absorption spectra, the energy bandgaps of pure Mn2O3, CuO, and the Mn2O3/CuO composite were estimated to be 2.6, 2.1, and 3.2 eV, respectively. The obtained materials were investigated for their photoluminescence (PL) and chromaticity characteristics to understand interfacial charge-transfer behavior. The PL spectra reveal broad blue - green emissions with main peaks located at 414 –437 nm for Mn2O3, 414 –439 nm for CuO, and a slightly red-shifted, intensified band at 435 nm for the Mn2O3/CuO composite. The corresponding CIE 1931 chromaticity coordinates (x ≈ 0.31, y ≈ 0.58) confirm a vivid green emission region, indicating improved color purity and radiative efficiency. These results demonstrate that coupling Mn2O3 with CuO tailors the electronic band alignment, suppresses non-radiative losses, and promotes strong visible luminescence, making the Mn2O3/CuO nanocomposite a promising candidate for green light - emitting and optoelectronic devices.