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<p>Eu<sup>3+</sup>-doped Bi<sub>6</sub>Ti<sub>3</sub>WO<sub>18</sub> (BTW) phosphors were synthesized via solid-state reaction route and systematically investigated to understand their structural and photoluminescent properties, with relevance to solid-state lighting and optical thermometry. X-ray diffraction (XRD) indicated the formation of a single-phase orthorhombic Aurivillius structure with space group A21am. Scanning electron microscopy (SEM) revealed agglomerated surface morphology, while the Fourier transform infrared (FT-IR) analysis confirmed the presence of characteristic metal–oxygen vibrational modes. The optical bandgap was estimated from UV–Vis diffuse reflectance spectra (DRS). Under 466-nm excitation, the Eu<sup>3+</sup>-doped BTW phosphors exhibited intense red emission centered at 615&#xa0;nm, arising from the dominant <sup>5</sup>D<sub>0</sub> → <sup>7</sup>F<sub>2</sub> transition, along with CIE coordinates (0.643, 0.352), very high color purity and a low correlated color temperature. Time-resolved photoluminescence (TRPL) exhibited bi-exponential behavior, and temperature-dependent PL (TDPL) measurements demonstrated good thermal stability with 68.7% emission retained at 443&#xa0;K with an activation energy of 0.267&#xa0;eV. An FIR-based ratiometric thermometry yielded a maximum relative sensitivity of 1.16% K<sup>−1</sup>. Overall, the obtained results demonstrate favorable chromaticity, good thermal stability, and effective temperature-sensing behavior in Eu<sup>3+</sup>-doped Bi<sub>6</sub>Ti<sub>3</sub>WO<sub>18</sub> phosphors.</p>

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Structural and photoluminescence studies of Eu3+-doped Bi6Ti3WO18 phosphors for solid-state lighting and optical thermometry

  • 期刊论文

  • 发表日期：

    2026年3月7日

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  • Aarti,
  • A. S. Rao,
  • Shailesh Narain Sharma

摘要

Eu3+-doped Bi6Ti3WO18 (BTW) phosphors were synthesized via solid-state reaction route and systematically investigated to understand their structural and photoluminescent properties, with relevance to solid-state lighting and optical thermometry. X-ray diffraction (XRD) indicated the formation of a single-phase orthorhombic Aurivillius structure with space group A21am. Scanning electron microscopy (SEM) revealed agglomerated surface morphology, while the Fourier transform infrared (FT-IR) analysis confirmed the presence of characteristic metal–oxygen vibrational modes. The optical bandgap was estimated from UV–Vis diffuse reflectance spectra (DRS). Under 466-nm excitation, the Eu3+-doped BTW phosphors exhibited intense red emission centered at 615 nm, arising from the dominant 5D0 → 7F2 transition, along with CIE coordinates (0.643, 0.352), very high color purity and a low correlated color temperature. Time-resolved photoluminescence (TRPL) exhibited bi-exponential behavior, and temperature-dependent PL (TDPL) measurements demonstrated good thermal stability with 68.7% emission retained at 443 K with an activation energy of 0.267 eV. An FIR-based ratiometric thermometry yielded a maximum relative sensitivity of 1.16% K−1. Overall, the obtained results demonstrate favorable chromaticity, good thermal stability, and effective temperature-sensing behavior in Eu3+-doped Bi6Ti3WO18 phosphors.