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<p>The pursuit of white light-emitting diodes (WLEDs) with high color rendering index (CRI) and stable chromaticity remains a significant challenge. This work presents a novel oxyapatite-type ZnLa<sub>4</sub>(SiO<sub>4</sub>)<sub>3</sub>O:Dy<sup>3+</sup> phosphors as a key component to address this issue. Under 387&#xa0;nm excitation, the optimized ZnLa<sub>4</sub>(SiO<sub>4</sub>)<sub>3</sub>O:2&#xa0;mol%Dy<sup>3+</sup> phosphor exhibits intense emissions at 480, 572, and 663&#xa0;nm, corresponding to the electronic transitions from the <sup>4</sup>F<sub>9/2</sub> level to the <sup>6</sup>H<sub>15/2</sub>, <sup>6</sup>H<sub>13/2</sub>, and <sup>6</sup>H<sub>11/2</sub> levels, respectively. The concentration quenching mechanism is identified as dipole–dipole interaction, with the optimal doping level at 2&#xa0;mol%. The phosphor demonstrates excellent color stability, emitting in the yellow region. More importantly, the WLED fabricated with this phosphor exhibited a high CRI (<i>R</i><sub>a</sub> = 89), a favorable correlated color temperature (CCT = 5740&#xa0;K), and CIE (Commission International de L’ Eclairage) coordinates (0.327, 0.334) remarkably close to pure white light (0.333, 0.333). These results underscore the great potential of ZnLa<sub>4</sub>(SiO<sub>4</sub>)<sub>3</sub>O:Dy<sup>3+</sup> phosphors for high-quality solid-state lighting.</p>

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Synthesis and luminescence properties of oxyapatite-type ZnLa4(SiO4)3O:Dy3+ yellow-emitting phosphor for high thermal stability in WLED

  • 期刊论文

  • 发表日期：

    2026年2月27日

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

摘要

The pursuit of white light-emitting diodes (WLEDs) with high color rendering index (CRI) and stable chromaticity remains a significant challenge. This work presents a novel oxyapatite-type ZnLa4(SiO4)3O:Dy3+ phosphors as a key component to address this issue. Under 387 nm excitation, the optimized ZnLa4(SiO4)3O:2 mol%Dy3+ phosphor exhibits intense emissions at 480, 572, and 663 nm, corresponding to the electronic transitions from the 4F9/2 level to the 6H15/2, 6H13/2, and 6H11/2 levels, respectively. The concentration quenching mechanism is identified as dipole–dipole interaction, with the optimal doping level at 2 mol%. The phosphor demonstrates excellent color stability, emitting in the yellow region. More importantly, the WLED fabricated with this phosphor exhibited a high CRI (Ra = 89), a favorable correlated color temperature (CCT = 5740 K), and CIE (Commission International de L’ Eclairage) coordinates (0.327, 0.334) remarkably close to pure white light (0.333, 0.333). These results underscore the great potential of ZnLa4(SiO4)3O:Dy3+ phosphors for high-quality solid-state lighting.