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<p>For the first time, Eu<sup>3+</sup>-doped Zn2V2O7 nanoparticles (NPs) were successfully synthesized via an eco-friendly solution combustion route using <i>Menthaspicata</i> leaf extract. X-ray diffraction con- firmed the monoclinic crystal structure (<i>C</i>2<i>/c</i>(2<i>/m</i>) space group), with crystallite sizes of 25–35&#xa0;nm, consistent with TEM analysis. A morphological transition from irregular to hexagonal-shaped NPs was observed upon Eu<sup>3+</sup> doping. Optical studies revealed a systematic reduction in the band gap from 3.03 to 2.94&#xa0;eV with increasing dopant concentration. Photoluminescence analysis showed strong red emission under 300&#xa0;nm excitation, with the electric dipole transition dominating and optimal intensity achieved at 5&#xa0;mol% Eu<sup>3+</sup>. The CIE chromaticity coordinates (x = 0.64, y = 0.35) were well-positioned in the red region, and the correlated color temperature (CCT) of 3110&#xa0;K confirmed a warm light emission. Electrochemical studies further demonstrated promising energy storage behavior, with specific capacitance values ranging from 73.76 to 123.74 F/g at 10&#xa0;mV/s. The Bode plot analysis revealed a short relaxation time constant (<i>τo</i> = 0.011&#xa0;s), indicating fast charge–discharge capability. These findings suggest that Eu<sup>3+</sup>-doped Zn2V2O7 NPs are multifunc- tional materials with significant potential for both photonic and supercapacitor applications.</p>

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Nanoarchitectonics of Eu3+ doped Zn2V2O7 phosphors for intense red luminescence and optoelectronic applications

  • 期刊论文

  • 发表日期：

    2026年1月23日

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  • Vinuta,
  • H. C. Manjunatha,
  • Y. S. Vidya,
  • S. Manjunatha,
  • R. Munirathnam,
  • M. Shivanna,
  • Suman Kumar,
  • Daruka Prasad B

摘要

For the first time, Eu3+-doped Zn2V2O7 nanoparticles (NPs) were successfully synthesized via an eco-friendly solution combustion route using Menthaspicata leaf extract. X-ray diffraction con- firmed the monoclinic crystal structure (C2/c(2/m) space group), with crystallite sizes of 25–35 nm, consistent with TEM analysis. A morphological transition from irregular to hexagonal-shaped NPs was observed upon Eu3+ doping. Optical studies revealed a systematic reduction in the band gap from 3.03 to 2.94 eV with increasing dopant concentration. Photoluminescence analysis showed strong red emission under 300 nm excitation, with the electric dipole transition dominating and optimal intensity achieved at 5 mol% Eu3+. The CIE chromaticity coordinates (x = 0.64, y = 0.35) were well-positioned in the red region, and the correlated color temperature (CCT) of 3110 K confirmed a warm light emission. Electrochemical studies further demonstrated promising energy storage behavior, with specific capacitance values ranging from 73.76 to 123.74 F/g at 10 mV/s. The Bode plot analysis revealed a short relaxation time constant (τo = 0.011 s), indicating fast charge–discharge capability. These findings suggest that Eu3+-doped Zn2V2O7 NPs are multifunc- tional materials with significant potential for both photonic and supercapacitor applications.