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<p>As the world evolves, the demand for efficient lighting sources is rising rapidly, and to cater to the burgeoning demand for swift expansion, technological advancement in white light-emitting diodes (WLEDs) and lighting materials is crucial. In this work, the photoluminescence of La<sub>2</sub>O<sub>3</sub> single-doped (Tm, Ho, Eu), double-doped and triple-doped phosphors prepared by combustion synthesis was studied. XRD confirms hexagonal phase (-P6c2c) with lattice contraction on doping, supported by Rietveld refinement, while SEM shows agglomerated particles (~ 12&#xa0;µm) and FTIR confirms La–O bonding. Under UV excitation, Tm<sup>3</sup>⁺, Ho<sup>3</sup>⁺ , and Eu<sup>3</sup>⁺ give blue, green, and orange-red emission, respectively; in Ho<sup>3</sup>⁺ doped samples, the small <sup>5</sup>F₄–<sup>5</sup>S<sub>2</sub> gap (~ 200&#xa0;cm⁻<sup>1</sup>) compared to host phonon energy (~ 400&#xa0;cm⁻<sup>1</sup>) leads to merged emission. Efficient energy transfer (Tm → Ho, Ho → Eu, Tm → Eu) is observed in co-doped and tri-doped systems, with La<sub>2</sub>O<sub>3</sub>:Tm/Ho/Eu phosphor showing a strong red component. These results suggest La<sub>2</sub>O<sub>3</sub>—based phosphors are promising candidates for WLEDs, barcode security, and multicolour LED applications.</p>

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Energy transfer and multicolour photoluminescence in phosphors La2O3 doped by Tm3⁺, Ho3⁺, and Eu3⁺ for white LED and security applications

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年12月8日

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  • Praful P. Khode,
  • Aditi Deshmukh,
  • Mateusz Czerwiński,
  • Marta Michalska-Domańska,
  • S. J. Dhoble

摘要

As the world evolves, the demand for efficient lighting sources is rising rapidly, and to cater to the burgeoning demand for swift expansion, technological advancement in white light-emitting diodes (WLEDs) and lighting materials is crucial. In this work, the photoluminescence of La2O3 single-doped (Tm, Ho, Eu), double-doped and triple-doped phosphors prepared by combustion synthesis was studied. XRD confirms hexagonal phase (-P6c2c) with lattice contraction on doping, supported by Rietveld refinement, while SEM shows agglomerated particles (~ 12 µm) and FTIR confirms La–O bonding. Under UV excitation, Tm3⁺, Ho3⁺ , and Eu3⁺ give blue, green, and orange-red emission, respectively; in Ho3⁺ doped samples, the small 5F₄–5S2 gap (~ 200 cm⁻1) compared to host phonon energy (~ 400 cm⁻1) leads to merged emission. Efficient energy transfer (Tm → Ho, Ho → Eu, Tm → Eu) is observed in co-doped and tri-doped systems, with La2O3:Tm/Ho/Eu phosphor showing a strong red component. These results suggest La2O3—based phosphors are promising candidates for WLEDs, barcode security, and multicolour LED applications.