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<p>In this work, we explore in detail the effects of erbium (Er³⁺) doping on the structural, optical, and electrical properties of SrBi₂Ta₂O₉ ceramics aiming for advanced electronic applications that require simultaneous energy storage and optical emission. Er³⁺-doped SrBi<sub>2 − x</sub>Ta<sub>2</sub>Er<sub>x</sub>O<sub>9</sub> ceramics (x = 0.00, 0.02, 0.04, 0.06, 0.08) were prepared through a standard solid-state reaction route and thoroughly examined using X-ray diffraction, scanning electron microscopy (SEM), Fourier-transform infrared (FTIR) spectroscopy, photoluminescence spectroscopy, dielectric and ferroelectric measurements. Our findings reveal that Er³⁺ substitution at Bi³⁺ sites in the (Bi<sub>2</sub>O<sub>2</sub>)<sup>+2</sup> layer, preserves the single-phase orthorhombic Aurivillius structure with noticeable but controlled lattice distortions. The best luminescence response and ferroelectric polarization (Pₘₐₓ = 4.57 µC/cm²) were achieved at x = 0.04, exhibiting strong green emission at 524&#xa0;nm and 549&#xa0;nm attributed to <sup>2</sup>H<sub>11/2</sub> → <sup>4</sup>I<sub>15/2</sub> and <sup>4</sup>S<sub>3/2</sub> → <sup>4</sup>I<sub>15/2</sub> transitions. The x = 0.02 composition demonstrated exceptional energy storage efficiency (η = 95.3–97.5%) across electric fields of 60–80&#xa0;kV/cm. Dielectric studies showed a concentration-dependent transition from normal ferroelectric to relaxor-like behavior, with x = 0.04 approaching complete relaxor characteristics (γ = 1.93102). This investigation highlights the key correlations between structural, optical and electronic properties in Er³⁺-doped SBTO ceramics, demonstrating their potential as versatile candidates for optical and energy storage devices. The demonstrated synergy between structural adaptability and multifunctional performance underscores the transformative potential of rare earth-doped Aurivillius ceramics.</p>

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Multifunctional Er³⁺-doped SrBi₂Ta₂O₉ ceramics: optimized energy storage and photoluminescence properties for advanced electronic applications

  • 期刊论文

  • 发表日期：

    2026年1月6日

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  • Vyom Khare,
  • Devesh Garg,
  • Surya Pratap Singh,
  • Megha Narwan,
  • Manoj Verma,
  • Renuka Bokolia

摘要

In this work, we explore in detail the effects of erbium (Er³⁺) doping on the structural, optical, and electrical properties of SrBi₂Ta₂O₉ ceramics aiming for advanced electronic applications that require simultaneous energy storage and optical emission. Er³⁺-doped SrBi2 − xTa2ErxO9 ceramics (x = 0.00, 0.02, 0.04, 0.06, 0.08) were prepared through a standard solid-state reaction route and thoroughly examined using X-ray diffraction, scanning electron microscopy (SEM), Fourier-transform infrared (FTIR) spectroscopy, photoluminescence spectroscopy, dielectric and ferroelectric measurements. Our findings reveal that Er³⁺ substitution at Bi³⁺ sites in the (Bi2O2)+2 layer, preserves the single-phase orthorhombic Aurivillius structure with noticeable but controlled lattice distortions. The best luminescence response and ferroelectric polarization (Pₘₐₓ = 4.57 µC/cm²) were achieved at x = 0.04, exhibiting strong green emission at 524 nm and 549 nm attributed to 2H11/2 → 4I15/2 and 4S3/2 → 4I15/2 transitions. The x = 0.02 composition demonstrated exceptional energy storage efficiency (η = 95.3–97.5%) across electric fields of 60–80 kV/cm. Dielectric studies showed a concentration-dependent transition from normal ferroelectric to relaxor-like behavior, with x = 0.04 approaching complete relaxor characteristics (γ = 1.93102). This investigation highlights the key correlations between structural, optical and electronic properties in Er³⁺-doped SBTO ceramics, demonstrating their potential as versatile candidates for optical and energy storage devices. The demonstrated synergy between structural adaptability and multifunctional performance underscores the transformative potential of rare earth-doped Aurivillius ceramics.