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<p>A series of orange-red ZnLa<sub>4</sub>(SiO<sub>4</sub>)<sub>3</sub>O:<i>x</i>Sm<sup>3+</sup> (ZLSO:<i>x</i>Sm<sup>3+</sup>) (<i>x</i> = 0.2, 0.5, 1, 2, 5, 10, 20, 30, and 35&#xa0;mol%) phosphors were synthesized via high-temperature solid-state reaction. In this experiment, the lattice environment, phase purity, element distribution, photoluminescence (PL) spectra, thermal stability at different temperatures, and color purity of the ZLSO: Sm<sup>3+</sup> phosphors were characterized. High-resolution transmission electron microscopy confirms the high crystallinity of the sample. When stimulated at the ideal wavelength of 403&#xa0;nm, the ZLSO: Sm<sup>3+</sup> phosphors displayed four significant emission peaks located at 562&#xa0;nm, 599&#xa0;nm, 648&#xa0;nm, and 711&#xa0;nm. The phosphor’s emission intensity was maximized when the Sm<sup>3+</sup> doping concentration was 2&#xa0;mol%. Additionally, at 420&#xa0;K, the ZLSO: Sm<sup>3+</sup> phosphor retained 86% of its initial emission intensity. The phosphor’s internal quantum efficiency (IQE) was determined to be 45.3%. During the experiments, it was found that the color purity of phosphors varied with Sm<sup>3+</sup> doping levels, but in all cases, it exceeded 98%. Additionally, white light-emitting diodes (w-LEDs) and red LEDs were effectively created by utilizing a 403&#xa0;nm near-ultraviolet (n-UV) chip in conjunction with the prepared phosphors. The CIE (Commission International de l’Eclairage) coordinates of the obtained w-LED were (0.337, 0.334), with a color rendering index (CRI, <i>R</i><sub>a</sub>) reaching 95. The experimental data suggest that the ZLSO: Sm<sup>3+</sup> orange-red phosphors hold great potential for use in lighting and optoelectronic applications.</p>

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The Preparation of orange-red Luminescence ZnLa4(SiO4)3O: Sm3+ Phosphors with High Thermal Stability and their Application in LEDs

  • 期刊论文

  • 发表日期：

    2025年9月17日

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  • Linghuan Li,
  • Huapeng Sun,
  • Anlin Zhang,
  • Yu Zhang,
  • Min Zhong,
  • Bin Deng

摘要

A series of orange-red ZnLa4(SiO4)3O:xSm3+ (ZLSO:xSm3+) (x = 0.2, 0.5, 1, 2, 5, 10, 20, 30, and 35 mol%) phosphors were synthesized via high-temperature solid-state reaction. In this experiment, the lattice environment, phase purity, element distribution, photoluminescence (PL) spectra, thermal stability at different temperatures, and color purity of the ZLSO: Sm3+ phosphors were characterized. High-resolution transmission electron microscopy confirms the high crystallinity of the sample. When stimulated at the ideal wavelength of 403 nm, the ZLSO: Sm3+ phosphors displayed four significant emission peaks located at 562 nm, 599 nm, 648 nm, and 711 nm. The phosphor’s emission intensity was maximized when the Sm3+ doping concentration was 2 mol%. Additionally, at 420 K, the ZLSO: Sm3+ phosphor retained 86% of its initial emission intensity. The phosphor’s internal quantum efficiency (IQE) was determined to be 45.3%. During the experiments, it was found that the color purity of phosphors varied with Sm3+ doping levels, but in all cases, it exceeded 98%. Additionally, white light-emitting diodes (w-LEDs) and red LEDs were effectively created by utilizing a 403 nm near-ultraviolet (n-UV) chip in conjunction with the prepared phosphors. The CIE (Commission International de l’Eclairage) coordinates of the obtained w-LED were (0.337, 0.334), with a color rendering index (CRI, Ra) reaching 95. The experimental data suggest that the ZLSO: Sm3+ orange-red phosphors hold great potential for use in lighting and optoelectronic applications.