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<p>At present, there are still challenges to develop highly efficient and thermally stable phosphors for ultraviolet/near ultraviolet excitable white light emitting diodes. Herein, we use the traditional high-temperature solid-state reaction method to prepare the red-emitting Sr<sub>3</sub>La<sub>2</sub>B<sub>4</sub>O<sub>12</sub>:xEu<sup>3+</sup> (1&#xa0;mol% ≤ <i>x</i> ≤ 15&#xa0;mol%) phosphors. Powder X-ray diffraction (PXRD) is employed to identify the phase purity and the effects of dopant concentration on the crystal structure. The lattice parameters are a = 8.78&#xa0;Å, b = 16.54&#xa0;Å, c = 7.42&#xa0;Å, and it has a primitive lattice space group - PC21n(33) with orthorhombic crystal structure. The existence of Sr, La, B, O and Eu elements are verified by&#xa0;the EDS&#xa0;spectrum. The band gap values are evaluated via diffuse reflectance spectroscopy. The outcome of the photoluminescence (PL) measurements unveils ‘the intensity and lifetime’ and this luminescence properties vary depending on the concentration of the Eu<sup>3+</sup>&#xa0;ions. The analysis of the Commission Internationale de l’Éclairage (CIE)&#xa0;chromaticity coordinates&#xa0;reveals the correlated colour temperature and the colour purity of the samples. The prepared phosphor shows relatively good thermal stability with the lifetime in the order of millisecond. The variable temperature decay time exhibits the sensitivity of the prepared phosphor. These results not only deepen our understanding of the fundamental&#xa0;physics&#xa0;governing such phosphors, but also open pathways for the development of&#xa0;optoelectronic applications&#xa0;requiring consistent colour output, such as&#xa0;white light emitting diodes (WLEDs)&#xa0;technologies and solid-state lighting.</p> Graphical abstract <p></p>

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Eu3+ activated Sr3La2B4O12 phosphors: high colour purity red emission and thermal stability for solid-state lighting

  • 期刊论文

  • 发表日期：

    2025年12月10日

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  • Beny Jermila S,
  • V. Rathina Mala,
  • S. Masilla Moses Kennedy

摘要

At present, there are still challenges to develop highly efficient and thermally stable phosphors for ultraviolet/near ultraviolet excitable white light emitting diodes. Herein, we use the traditional high-temperature solid-state reaction method to prepare the red-emitting Sr3La2B4O12:xEu3+ (1 mol% ≤ x ≤ 15 mol%) phosphors. Powder X-ray diffraction (PXRD) is employed to identify the phase purity and the effects of dopant concentration on the crystal structure. The lattice parameters are a = 8.78 Å, b = 16.54 Å, c = 7.42 Å, and it has a primitive lattice space group - PC21n(33) with orthorhombic crystal structure. The existence of Sr, La, B, O and Eu elements are verified by the EDS spectrum. The band gap values are evaluated via diffuse reflectance spectroscopy. The outcome of the photoluminescence (PL) measurements unveils ‘the intensity and lifetime’ and this luminescence properties vary depending on the concentration of the Eu3+ ions. The analysis of the Commission Internationale de l’Éclairage (CIE) chromaticity coordinates reveals the correlated colour temperature and the colour purity of the samples. The prepared phosphor shows relatively good thermal stability with the lifetime in the order of millisecond. The variable temperature decay time exhibits the sensitivity of the prepared phosphor. These results not only deepen our understanding of the fundamental physics governing such phosphors, but also open pathways for the development of optoelectronic applications requiring consistent colour output, such as white light emitting diodes (WLEDs) technologies and solid-state lighting.

Graphical abstract