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<p>Eu<sup>3+</sup> doped Sr<sub>4</sub>Gd<sub>3</sub>Na<sub>3</sub>(PO<sub>4</sub>)<sub>6</sub>F<sub>2</sub> phosphor samples with varying concentration were successfully synthesized by using a solid-state diffusion approach. Phase purity and morphological behaviour were characterized by powder X-ray diffraction (PXRD), scanning electron microscopy (SEM) and energy dispersive X-ray analysis (EDX). the stretching and bonding behaviours of the prepared phosphor were analysed by Fourier transform infrared (FTIR)spectroscopy. In photoluminescence study (PL), the emission spectra recorded under 465&#xa0;nm excitation showed the highest intensity peak at 612&#xa0;nm, attributed to the <sup>5</sup>D<sub>0</sub> → <sup>7</sup>F<sub>2</sub> electric dipole transition of Eu<sup>3+</sup>. The CIE chromaticity coordinates (x = 0.5655, y = 0.4335), color purity of 69.46%, and correlated color temperature (CCT) of 1843&#xa0;K confirmed warm orange-red emission. Judd–Ofelt (JO) intensity parameters Ω<sub>2</sub> = 2.175, Ω<sub>4</sub> = 0.145, and asymmetry ratio <i>R</i> = 1.351 indicate that Eu<sup>3+</sup> occupies low-symmetry sites in the host lattice, enhancing red emission. Therefore, the optical behaviour and radiative properties of Sr<sub>4</sub>Gd<sub>3</sub>Na<sub>3</sub>(PO<sub>4</sub>)<sub>6</sub>F<sub>2</sub>:Eu<sup>3+</sup> phosphor suggest its promising application as a red-emitting component in white light-emitting diodes (WLEDs).</p>

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Comprehensive photoluminescence analysis and Judd-Ofelt analysis of eu³⁺-Activated Sr₄Gd₃Na₃(PO₄)₆F₂ phosphor: theoretical elucidation from PL emission spectra for optimized red emission

  • 期刊论文

  • 发表日期：

    2025年8月9日

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  • Rahul V. Tikale,
  • Abhijeet R. Kadam,
  • S. J. Dhoble

摘要

Eu3+ doped Sr4Gd3Na3(PO4)6F2 phosphor samples with varying concentration were successfully synthesized by using a solid-state diffusion approach. Phase purity and morphological behaviour were characterized by powder X-ray diffraction (PXRD), scanning electron microscopy (SEM) and energy dispersive X-ray analysis (EDX). the stretching and bonding behaviours of the prepared phosphor were analysed by Fourier transform infrared (FTIR)spectroscopy. In photoluminescence study (PL), the emission spectra recorded under 465 nm excitation showed the highest intensity peak at 612 nm, attributed to the 5D0 → 7F2 electric dipole transition of Eu3+. The CIE chromaticity coordinates (x = 0.5655, y = 0.4335), color purity of 69.46%, and correlated color temperature (CCT) of 1843 K confirmed warm orange-red emission. Judd–Ofelt (JO) intensity parameters Ω2 = 2.175, Ω4 = 0.145, and asymmetry ratio R = 1.351 indicate that Eu3+ occupies low-symmetry sites in the host lattice, enhancing red emission. Therefore, the optical behaviour and radiative properties of Sr4Gd3Na3(PO4)6F2:Eu3+ phosphor suggest its promising application as a red-emitting component in white light-emitting diodes (WLEDs).