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<p>Li<sub>7</sub>La<sub>3</sub>Zr<sub>2</sub>O<sub>12</sub> (LLZO) garnet ceramics co-doped with Ta<sup>5+</sup> and Bi<sup>3+</sup> were synthesized via a conventional solid-state reaction method and systematically investigated for their structural, photoluminescence, and dielectric properties. X-ray diffraction analysis revealed that the synthesized samples predominantly exhibit the tetragonal garnet-type LLZO phase, accompanied by minor secondary phases. Microstructural analysis using transmission electron microscopy (TEM) and selected area electron diffraction (SAED) revealed well-defined crystalline domains, while x-ray photoelectron spectroscopy (XPS) confirmed the presence of Li, La, Zr, Ta, O, and Bi within the host lattice. Photoluminescence measurements under 236&#xa0;nm excitation exhibited a prominent yellow emission centered at ~558&#xa0;nm attributed to the Bi<sup>3+</sup> (<sup>3</sup>P<sub>1</sub> → <sup>1</sup>S<sub>0</sub>) transition. In contrast, weak blue emission from the host lattice is associated with oxygen-vacancy-related defect states. The emission characteristics were found to depend on Bi<sup>3+</sup> concentration due to concentration quenching. Dielectric measurements demonstrated frequency-dependent polarization behavior with relatively low dielectric loss at higher frequencies. The results indicate that Bi<sup>3+</sup>-activated Ta-stabilized LLZO ceramics exhibit tunable optical emission and stable dielectric response, highlighting their potential as multifunctional materials for electronic and optoelectronic applications.</p>

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Bi3+-Assisted Defect Engineering in Ta-Stabilized Li7La3Zr2O12 Garnet Electrolytes: Structural, Dielectric, and Photoluminescence Correlations

  • 期刊论文

  • 发表日期：

    2026年5月15日

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  • S. Vijayaraghavan,
  • K. Gokulkannan,
  • M. Sudhakar,
  • Mohamed Abbas,
  • Vijayakumar Paranthaman,
  • B. Chandrasekaran,
  • K. Ganesh Kumar

摘要

Li7La3Zr2O12 (LLZO) garnet ceramics co-doped with Ta5+ and Bi3+ were synthesized via a conventional solid-state reaction method and systematically investigated for their structural, photoluminescence, and dielectric properties. X-ray diffraction analysis revealed that the synthesized samples predominantly exhibit the tetragonal garnet-type LLZO phase, accompanied by minor secondary phases. Microstructural analysis using transmission electron microscopy (TEM) and selected area electron diffraction (SAED) revealed well-defined crystalline domains, while x-ray photoelectron spectroscopy (XPS) confirmed the presence of Li, La, Zr, Ta, O, and Bi within the host lattice. Photoluminescence measurements under 236 nm excitation exhibited a prominent yellow emission centered at ~558 nm attributed to the Bi3+ (3P1 → 1S0) transition. In contrast, weak blue emission from the host lattice is associated with oxygen-vacancy-related defect states. The emission characteristics were found to depend on Bi3+ concentration due to concentration quenching. Dielectric measurements demonstrated frequency-dependent polarization behavior with relatively low dielectric loss at higher frequencies. The results indicate that Bi3+-activated Ta-stabilized LLZO ceramics exhibit tunable optical emission and stable dielectric response, highlighting their potential as multifunctional materials for electronic and optoelectronic applications.