保存先:
| 第一著者: | |
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| フォーマット: | Recurso digital |
| 言語: | |
| 出版事項: |
Zenodo
2024
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| オンライン･アクセス: | https://doi.org/10.5281/zenodo.19694105 |
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目次:
- <p>A series of dysprosium (Dy³⁺)-doped phosphate glasses with varying Dy₂O₃ concentrations were successfully synthesized via the conventional melt-quenching technique. X-ray diffraction (XRD) analysis confirmed the amorphous nature of all prepared samples, while elemental mapping verified the homogeneous distribution of constituent elements throughout the glass matrix.Optical absorption spectra were analyzed using Judd–Ofelt (J–O) theory, and the calculated intensity parameters (Ω₂, Ω₄, Ω₆) followed the order Ω₂ > Ω₆ > Ω₄. This trend suggests a highly asymmetric local environment and significant covalent bonding character around the Dy³⁺ ions.Photoluminescence (PL) studies under 350 nm excitation revealed characteristic emissions corresponding to the ⁴F₉/₂ → ⁶Hⱼ transitions, including a weak red emission (⁴F₉/₂ → ⁶H₁₁/₂), along with intense blue (⁴F₉/₂ → ⁶H₁₅/₂) and yellow (⁴F₉/₂ → ⁶H₁₃/₂) bands. Lifetime measurements of the ⁴F₉/₂ excited state indicated that the emission intensity reached a maximum at 0.5 mol% Dy₂O₃, beyond which concentration quenching effects became prominent. Furthermore, the near-white light emission characteristics were evaluated through the yellow-toblue (Y/B) intensity ratio, correlated color temperature (CCT), and Commission Internationale de l'Éclairage (CIE) chromaticity coordinates, confirming the potential applicability of the prepared glasses in solid-state lighting devices.</p>