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<p>We developed a simple method for improving the water resistance on luminescence, <i>i.e.</i>, luminescence durability under wet conditions, of Ca<sub>14</sub>Al<sub>10</sub>Zn<sub>6</sub>O<sub>35</sub>:Mn<sup>4+</sup> (CZA) phosphor particles using silica coating. The CZA particles were coated with silica shells by adding a tetraethyl orthosilicate/ethanol solution and sodium hydroxide to an ethanol dispersion of the CZA powder (CZA/SiO<sub>2</sub>). Two methods were examined to improve water resistance. The first involved thickening the silica shells through multiple coatings. After three coatings and immersion in water for 24 h, the fluorescence intensity decreased to 83.7% of the original value. The second method involved annealing the CZA/SiO<sub>2</sub> particles to densify the silica shells, as confirmed by N<sub>2</sub> adsorption–desorption experiments. Annealing at 700&#xa0;°C decreased luminescence intensity to 87.5% of the initial value, even after seven days of immersion in water. Thus, annealing was an effective method for enhancing the water resistance of silica-coated CZA particles.</p> Graphical abstract <p></p>

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Improving luminescence durability of silica-coated Ca14Al10Zn6O35:Mn4+ particles under wet conditions through shell-thickening and annealing

  • 期刊论文

  • 发表日期：

    2025年6月2日

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  • Ai Yamamoto,
  • Mizuki Ito,
  • Noriko Yamauchi,
  • Shohei Tada,
  • Hiroshi Okura,
  • Yoshio Kobayashi

摘要

We developed a simple method for improving the water resistance on luminescence, i.e., luminescence durability under wet conditions, of Ca14Al10Zn6O35:Mn4+ (CZA) phosphor particles using silica coating. The CZA particles were coated with silica shells by adding a tetraethyl orthosilicate/ethanol solution and sodium hydroxide to an ethanol dispersion of the CZA powder (CZA/SiO2). Two methods were examined to improve water resistance. The first involved thickening the silica shells through multiple coatings. After three coatings and immersion in water for 24 h, the fluorescence intensity decreased to 83.7% of the original value. The second method involved annealing the CZA/SiO2 particles to densify the silica shells, as confirmed by N2 adsorption–desorption experiments. Annealing at 700 °C decreased luminescence intensity to 87.5% of the initial value, even after seven days of immersion in water. Thus, annealing was an effective method for enhancing the water resistance of silica-coated CZA particles.

Graphical abstract