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<p>This work explores the green-mediated combustion method using jamun fruit as a fuel, to fabricate (1–7&#xa0;mol %) Sm³⁺doped ZnO nanophosphors. These nanophosphors are being examined for their potential applications in solid-state lighting or white LEDs and water splitting and environmental applications. The Sm³⁺doped MgO nano phosphors exhibited a cubic crystal structure with non-uniform, agglomerated flaky Morphology. The average optical energy gap of the phosphors is found to be around 3.13&#xa0;eV confirmed by Diffused Reflectance spectra (DRS). The photoluminescence spectra of the phosphor exhibit three distinct emission bands, blue emission (400&#xa0;nm to 480&#xa0;nm), green emission (480&#xa0;nm to 550&#xa0;nm), and red emission (600&#xa0;nm to 750&#xa0;nm). The color coordinates positioned the emission in the orange-red region of the chromaticity diagram, and the high color purity and correlated color temperature (1900&#xa0;K) make these nanophosphors promising candidates for solid-state lighting and display technologies. Further, to assess the photocatalytic activity, the optimized concentration of the prepared ZnO: Sm<sup>3+</sup> (3&#xa0;mol%) material was evaluated for the degradation of Congo Red (CR) dye under UV Light. The material exhibited a remarkable photodegradation efficiency of 82.35% within 120&#xa0;min. The significant improvement in photodegradation efficiency can be attributed to factors such as expanding the specific surface area, broadening the visible light absorption spectrum, and enhancing resistance to redox potential during CR oxidation. Furthermore, the stability and reusability tests demonstrated that the ZnO: Sm<sup>3+</sup> (3&#xa0;mol%) material retained its photocatalytic activity, with only a minor 8% decrease in efficiency after multiple cycles All the above-obtained results highlight the potential of ZnO: Sm<sup>3+</sup> material as a promising material for various applications such as solid state lightening, white LEDs, display and environmental remediation.</p>

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Blue-red tunable emission of ZnO: Sm³+ nanophosphors: a comprehensive study for optoelectronic and environmental applications

  • 期刊论文

  • 发表日期：

    2025年10月14日

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  • K. M. Girish,
  • Lavanya R,
  • S. C. Prashantha,
  • T. Ramakrishnappa,
  • Ramachandra Naik,
  • H. P. Nagaswarupa,
  • A. Naveen kumar

摘要

This work explores the green-mediated combustion method using jamun fruit as a fuel, to fabricate (1–7 mol %) Sm³⁺doped ZnO nanophosphors. These nanophosphors are being examined for their potential applications in solid-state lighting or white LEDs and water splitting and environmental applications. The Sm³⁺doped MgO nano phosphors exhibited a cubic crystal structure with non-uniform, agglomerated flaky Morphology. The average optical energy gap of the phosphors is found to be around 3.13 eV confirmed by Diffused Reflectance spectra (DRS). The photoluminescence spectra of the phosphor exhibit three distinct emission bands, blue emission (400 nm to 480 nm), green emission (480 nm to 550 nm), and red emission (600 nm to 750 nm). The color coordinates positioned the emission in the orange-red region of the chromaticity diagram, and the high color purity and correlated color temperature (1900 K) make these nanophosphors promising candidates for solid-state lighting and display technologies. Further, to assess the photocatalytic activity, the optimized concentration of the prepared ZnO: Sm3+ (3 mol%) material was evaluated for the degradation of Congo Red (CR) dye under UV Light. The material exhibited a remarkable photodegradation efficiency of 82.35% within 120 min. The significant improvement in photodegradation efficiency can be attributed to factors such as expanding the specific surface area, broadening the visible light absorption spectrum, and enhancing resistance to redox potential during CR oxidation. Furthermore, the stability and reusability tests demonstrated that the ZnO: Sm3+ (3 mol%) material retained its photocatalytic activity, with only a minor 8% decrease in efficiency after multiple cycles All the above-obtained results highlight the potential of ZnO: Sm3+ material as a promising material for various applications such as solid state lightening, white LEDs, display and environmental remediation.