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<p>Dy<sup>3+</sup> and Eu<sup>3+</sup> coactivated NaSrY(BO<sub>3</sub>)<sub>2</sub> phosphors were prepared using a solid-state diffusion method. Singly doped NaSrY(BO<sub>3</sub>)<sub>2</sub>: Dy<sup>3+</sup> phosphors showed dual emission peaks in the blue and yellow regions of the visible light spectrum, which were insufficient to provide the white light with a desirable color rendering index (CRI) and correlated color temperature (CCT). The absence of the red component was the major reason behind the failure of Dy<sup>3+</sup>-doped phosphors in producing luminescence with suitable CRI and CCT. This issue was resolved by introducing an appropriate quantity of Eu<sup>3+</sup> ions that contributed the red luminescence peaks and compensated for the missing red component in the Dy<sup>3+</sup> spectrum. This approach improved the CRI of the phosphors as compared to the singly doped NaSrY(BO<sub>3</sub>)<sub>2</sub>: Dy<sup>3+</sup> phosphors. Owing to the stable crystal structure of NaSrY(BO<sub>3</sub>)<sub>2</sub>, the lanthanide ions were able to successfully incorporate and luminesce in the lattice. By varying the Dy<sup>3+</sup>/Eu<sup>3+</sup> ratio, it was possible to tune the CCT and achieve optimum warm-white emissions with a desirable CCT. With this approach, NaSrY(BO<sub>3</sub>)<sub>2</sub>: Dy<sup>3+</sup>, Eu<sup>3+</sup> phosphors produced warm-white light with promising applications in advanced lighting solutions and display devices.</p>

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Warm-white emitting Dy³⁺ and Eu³⁺ coactivated NaSrY(BO3)2 phosphors for solid-state lighting

  • 期刊论文

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  • 发表日期：

    2025年9月26日

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  • Shital W. Awaghade,
  • Govind B. Nair,
  • N. S. Dhoble,
  • S. J. Dhoble

摘要

Dy3+ and Eu3+ coactivated NaSrY(BO3)2 phosphors were prepared using a solid-state diffusion method. Singly doped NaSrY(BO3)2: Dy3+ phosphors showed dual emission peaks in the blue and yellow regions of the visible light spectrum, which were insufficient to provide the white light with a desirable color rendering index (CRI) and correlated color temperature (CCT). The absence of the red component was the major reason behind the failure of Dy3+-doped phosphors in producing luminescence with suitable CRI and CCT. This issue was resolved by introducing an appropriate quantity of Eu3+ ions that contributed the red luminescence peaks and compensated for the missing red component in the Dy3+ spectrum. This approach improved the CRI of the phosphors as compared to the singly doped NaSrY(BO3)2: Dy3+ phosphors. Owing to the stable crystal structure of NaSrY(BO3)2, the lanthanide ions were able to successfully incorporate and luminesce in the lattice. By varying the Dy3+/Eu3+ ratio, it was possible to tune the CCT and achieve optimum warm-white emissions with a desirable CCT. With this approach, NaSrY(BO3)2: Dy3+, Eu3+ phosphors produced warm-white light with promising applications in advanced lighting solutions and display devices.