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<p>The reduction in photoluminescence efficiency due to crystallite downsizing is a significant issue in Mn<sup>4+</sup> -doped fluoride nanomaterials, crucial for their application in full-color micro-LED displays. This study presents a strategy to enhance the photoluminescence efficiency of K<sub>3</sub>AlF<sub>6</sub>:Mn<sup>4+</sup> nanocrystals (NCs) by incorporating Mg<sup>2+</sup> for charge compensation and utilizing the plasmonic effect of Au nanorods. We found that Mg<sup>2+</sup> incorporation effectively reduced lattice defects, increasing photoluminescence intensity by 17% and internal quantum efficiency from 22.37% to 27.56%. Fabricating Au@SiO<sub>2</sub>/fluoride nanocomposites, we investigated how the SiO<sub>2</sub> spacer layer thickness, Au@SiO<sub>2</sub> resonance wavelength, and relative concentration affect photoluminescence properties. Optimizing the balance between Purcell and Förster resonance energy transfer effects further increased photoluminescence intensity by 25%, internal quantum efficiency to 32.09%, and external quantum efficiency from 14.20% to 18.05%. Additionally, we assessed the potential application of these nanocomposites in micro-LED display technology by examining nanocomposite-PMMA films. This work provides insights into the development of highly efficient red-emitting nanomaterials.</p>

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Modulating luminescence of K3AlF6:Mn4+ NCs via charge compensation and localized surface plasmon resonance effect

  • 期刊论文

  • 发表日期：

    2025年3月11日

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  • Chen Yang,
  • Yuhuan Tan,
  • Zheyi Li,
  • Shan Liang,
  • Xi-Hua Guan,
  • Zhong-Jian Yang,
  • Shixun Lian,
  • Wenli Zhou

摘要

The reduction in photoluminescence efficiency due to crystallite downsizing is a significant issue in Mn4+ -doped fluoride nanomaterials, crucial for their application in full-color micro-LED displays. This study presents a strategy to enhance the photoluminescence efficiency of K3AlF6:Mn4+ nanocrystals (NCs) by incorporating Mg2+ for charge compensation and utilizing the plasmonic effect of Au nanorods. We found that Mg2+ incorporation effectively reduced lattice defects, increasing photoluminescence intensity by 17% and internal quantum efficiency from 22.37% to 27.56%. Fabricating Au@SiO2/fluoride nanocomposites, we investigated how the SiO2 spacer layer thickness, Au@SiO2 resonance wavelength, and relative concentration affect photoluminescence properties. Optimizing the balance between Purcell and Förster resonance energy transfer effects further increased photoluminescence intensity by 25%, internal quantum efficiency to 32.09%, and external quantum efficiency from 14.20% to 18.05%. Additionally, we assessed the potential application of these nanocomposites in micro-LED display technology by examining nanocomposite-PMMA films. This work provides insights into the development of highly efficient red-emitting nanomaterials.