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A series of BaSr2TeO6:xDy3+ (x = 0, 0.02, 0.04, 0.06, 0.08, and 0.10) phosphors were successfully prepared via conventional solid-state reaction method. XRD analysis confirmed the formation of a single-phase structure and FTIR spectroscopy revealed the characteristic Te–O vibrational bands. SEM images show that the optimized BaSr₂TeO₆:0.04Dy3+ phosphor exhibited agglomerated morphology with an average particle size of 1.51 μm. EDS validated the elemental composition of the samples and confirmed the successful incorporation of Dy3+ in the host. Diffuse reflectance spectroscopy (DRS) analysis showed that the materials possess wide band gaps in the range of 5.11–5.17 eV, suggesting their suitability for optoelectronic and photonic applications. Photoluminescence emission under 351 nm excitation exhibited prominent blue (482 nm), yellow (575 nm), and far-red (675 nm) emissions attributed to Dy3+ transitions, resulting in near-white light emission. The phosphor with x = 0.04 displayed the highest luminescence efficiency. The observed concentration quenching beyond this concentration is attributed to dipole–dipole interactions between adjacent Dy3+ ions. The calculated CIE chromaticity coordinates were found to be close to those of commercial white LEDs, while the correlated color temperature values (ranging from 4100 to 4700 K) categorized the emission as cool white light. These results demonstrate that BaSr2TeO6:xDy3+ phosphors are promising candidates for single-phase white-light emitters, particularly for outdoor lighting applications.

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Structural and Luminescent Properties of Cool White Light Emitting Dy3+ Doped BaSr2TeO6 Phosphors for Outdoor Lighting Applications

  • 会议论文

  • 发表日期：

    2025年

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  • Arya Gopinath,
  • Sincy Anna Oommen,
  • P. B. Gayathri,
  • P. R. Biju

摘要

A series of BaSr2TeO6:xDy3+ (x = 0, 0.02, 0.04, 0.06, 0.08, and 0.10) phosphors were successfully prepared via conventional solid-state reaction method. XRD analysis confirmed the formation of a single-phase structure and FTIR spectroscopy revealed the characteristic Te–O vibrational bands. SEM images show that the optimized BaSr₂TeO₆:0.04Dy3+ phosphor exhibited agglomerated morphology with an average particle size of 1.51 μm. EDS validated the elemental composition of the samples and confirmed the successful incorporation of Dy3+ in the host. Diffuse reflectance spectroscopy (DRS) analysis showed that the materials possess wide band gaps in the range of 5.11–5.17 eV, suggesting their suitability for optoelectronic and photonic applications. Photoluminescence emission under 351 nm excitation exhibited prominent blue (482 nm), yellow (575 nm), and far-red (675 nm) emissions attributed to Dy3+ transitions, resulting in near-white light emission. The phosphor with x = 0.04 displayed the highest luminescence efficiency. The observed concentration quenching beyond this concentration is attributed to dipole–dipole interactions between adjacent Dy3+ ions. The calculated CIE chromaticity coordinates were found to be close to those of commercial white LEDs, while the correlated color temperature values (ranging from 4100 to 4700 K) categorized the emission as cool white light. These results demonstrate that BaSr2TeO6:xDy3+ phosphors are promising candidates for single-phase white-light emitters, particularly for outdoor lighting applications.