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<p>In recent years, rare-earth-doped inorganic phosphors have gained significant attention in the field of display technologies. In this study, 0.7&#xa0;mol% Tb<sup>3+</sup> x mol% Eu<sup>3+</sup> -activated KAlF<sub>4</sub> phosphors were synthesized using the wet chemical method. The crystal structure and phase composition of the obtained phosphors were characterized through X-ray diffraction (XRD) combined with Rietveld refinement. Photoluminescence (PL) studies revealed that, under excitations at 394&#xa0;nm and 466&#xa0;nm, Eu<sup>3+</sup>-doped and Tb<sup>3+</sup>/Eu<sup>3+</sup> co-doped KAlF<sub>4</sub> phosphors displayed prominent emissions: an orange peak at 594&#xa0;nm and a red peak at 614&#xa0;nm corresponding to the <sup>5</sup>D<sub>0</sub>&#xa0;→&#xa0;<sup>7</sup>F<sub>1</sub> and <sup>5</sup>D<sub>0</sub>&#xa0;→&#xa0;<sup>7</sup>F<sub>2</sub> transitions of Eu<sup>3+</sup>, respectively, while Tb<sup>3+</sup> doping yielded green emission. Co-doping both ions in the host matrix resulted in photoluminescence with color tunability from green to red. These findings suggest that the synthesized phosphors are promising candidates for white light-emitting diodes (WLEDs) and display device applications.</p>

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Structural and Optical Properties of Tb3+/Eu3+ Doped KAlF4 Phosphors: A Potential Photochromic Material for Solid-State Lighting

  • 期刊论文

  • 发表日期：

    2026年1月5日

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  • Mahendra R. Pansare,
  • Gajanan S. Solanke,
  • Abhijeet R. Kadam

摘要

In recent years, rare-earth-doped inorganic phosphors have gained significant attention in the field of display technologies. In this study, 0.7 mol% Tb3+ x mol% Eu3+ -activated KAlF4 phosphors were synthesized using the wet chemical method. The crystal structure and phase composition of the obtained phosphors were characterized through X-ray diffraction (XRD) combined with Rietveld refinement. Photoluminescence (PL) studies revealed that, under excitations at 394 nm and 466 nm, Eu3+-doped and Tb3+/Eu3+ co-doped KAlF4 phosphors displayed prominent emissions: an orange peak at 594 nm and a red peak at 614 nm corresponding to the 5D0 → 7F1 and 5D0 → 7F2 transitions of Eu3+, respectively, while Tb3+ doping yielded green emission. Co-doping both ions in the host matrix resulted in photoluminescence with color tunability from green to red. These findings suggest that the synthesized phosphors are promising candidates for white light-emitting diodes (WLEDs) and display device applications.