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<p>In this study, a type of phosphor, the double-perovskite compound Cd<sub>2</sub>CaTeO<sub>6</sub>:<i>x</i>Dy<sup>3+</sup> (where <i>x</i> takes the values of 0.5&#xa0;mol.%, 1&#xa0;mol.%, 2&#xa0;mol.%, 5&#xa0;mol.%, 10&#xa0;mol.%, 15&#xa0;mol.%, 20&#xa0;mol.%, and 25&#xa0;mol.%), was synthesized by the high-temperature solid-state method. The phase purity, particle morphology, elemental composition, and optical properties were systematically investigated. The prepared fluorescent material has high phase purity. The results show that Cd<sub>2</sub>CaTeO<sub>6</sub>:Dy<sup>3+</sup> has a strong yellow emission peak at 576&#xa0;nm with excitation at 390&#xa0;nm, which is caused by the radiative transitions of electrons. The excitation conditions of the phosphor can be easily matched to existing common near-ultraviolet light-emitting diode (LED) chips. In Cd<sub>2</sub>CaTeO<sub>6</sub>:Dy<sup>3+</sup> phosphors, Dy<sup>3+</sup> enters the Cd<sub>2</sub>CaTeO<sub>6</sub> lattice as a doped luminescent center, and the luminescence behavior can be easily regulated by Dy<sup>3+</sup> content. The optimal doping concentration of Dy<sup>3+</sup> was observed to be 5&#xa0;mol.% in this series of Cd<sub>2</sub>CaTeO<sub>6</sub>:Dy<sup>3+</sup>, and concentration quenching due to dipole–dipole interactions was determined. The phosphor has reasonable Commission International de L’Eclairage (CIE) chromaticity coordinates in the yellow light zone, and changes in Dy<sup>3+</sup> concentration did not cause significant changes in fluorescence color. In addition, the thermal stability of the phosphor indicated its promise for application in white LEDs (W-LEDs). Luminous intensity was maintained at 31% at 480&#xa0;K. The lampsealing application is explored. Based on Cd<sub>2</sub>CaTeO<sub>6</sub>:Dy<sup>3+</sup>, a warm W-LED was fabricated with an excellent color rendering index (CRI, <i>R</i><sub>a</sub>) of 96 for illumination and a relatively low correlated color temperature (CCT) of 5785&#xa0;K. The phosphors described above offer a promising option for W-LEDs.</p>

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Optical Properties and Application of Dy3+-Doped Cd2CaTeO6 Yellow Phosphors for White LEDs

  • 期刊论文

  • 发表日期：

    2025年1月6日

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  • Huapeng Sun,
  • Xiang Li,
  • Anlin Zhang,
  • Yanhua Lei,
  • Bin Deng

摘要

In this study, a type of phosphor, the double-perovskite compound Cd2CaTeO6:xDy3+ (where x takes the values of 0.5 mol.%, 1 mol.%, 2 mol.%, 5 mol.%, 10 mol.%, 15 mol.%, 20 mol.%, and 25 mol.%), was synthesized by the high-temperature solid-state method. The phase purity, particle morphology, elemental composition, and optical properties were systematically investigated. The prepared fluorescent material has high phase purity. The results show that Cd2CaTeO6:Dy3+ has a strong yellow emission peak at 576 nm with excitation at 390 nm, which is caused by the radiative transitions of electrons. The excitation conditions of the phosphor can be easily matched to existing common near-ultraviolet light-emitting diode (LED) chips. In Cd2CaTeO6:Dy3+ phosphors, Dy3+ enters the Cd2CaTeO6 lattice as a doped luminescent center, and the luminescence behavior can be easily regulated by Dy3+ content. The optimal doping concentration of Dy3+ was observed to be 5 mol.% in this series of Cd2CaTeO6:Dy3+, and concentration quenching due to dipole–dipole interactions was determined. The phosphor has reasonable Commission International de L’Eclairage (CIE) chromaticity coordinates in the yellow light zone, and changes in Dy3+ concentration did not cause significant changes in fluorescence color. In addition, the thermal stability of the phosphor indicated its promise for application in white LEDs (W-LEDs). Luminous intensity was maintained at 31% at 480 K. The lampsealing application is explored. Based on Cd2CaTeO6:Dy3+, a warm W-LED was fabricated with an excellent color rendering index (CRI, Ra) of 96 for illumination and a relatively low correlated color temperature (CCT) of 5785 K. The phosphors described above offer a promising option for W-LEDs.