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<p>In this work, a batch of Tm<sup>3+</sup>-doped Ca<sub>2</sub>Ga<sub>2</sub>SiO<sub>7</sub> phosphors was successfully synthesized via the conventional solid-state reaction method and systematically investigated for structural and photoluminescence properties. X-ray diffraction results confirmed the formation of a single-phase tetrahedral structure of Ca<sub>2</sub>Ga<sub>2</sub>SiO<sub>7</sub> with a P421m space group and no detectable impurity phase, indicating successful incorporation of Tm<sup>3+</sup> ions into the host lattice. Under near-ultraviolet excitation of 355&#xa0;nm, the phosphors exhibited intense blue emission centered at 455&#xa0;nm. The emission peak is attributed to the <sup>1</sup>D<sub>2</sub> → <sup>3</sup>F<sub>4</sub> transition of Tm<sup>3+</sup> ions. The concentration-dependent study revealed an optimal dopant level of 1.0&#xa0;mol% of Tm<sup>3+</sup>, beyond which concentration quenching occurs. The chromaticity coordinates of the optimized phosphor fall in the ideal blue region of the CIE 1931 diagram, confirming its potential to emit white light when combined with red and green phosphors. Decay time analysis showed a reduction in lifetime with increasing dopant concentration, suggesting energy transfer between neighboring Tm<sup>3+</sup> ions. The results demonstrate that Ca<sub>2</sub>Ga<sub>2</sub>SiO<sub>7</sub>:Tm<sup>3+</sup> is a promising candidate for next-generation solid-state lighting applications.</p>

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Tm3+-Doped Ca2Ga2SiO7 Phosphor as Blue-Emitting Candidate for Tricolor w-LED Application

  • 期刊论文

  • 发表日期：

    2025年9月11日

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  • Anand Parasar,
  • Kusum Rawat,
  • Amit Kumar Vishwakarma,
  • Sunil Kumar,
  • Sanjay Kumar,
  • Kaushal Jha

摘要

In this work, a batch of Tm3+-doped Ca2Ga2SiO7 phosphors was successfully synthesized via the conventional solid-state reaction method and systematically investigated for structural and photoluminescence properties. X-ray diffraction results confirmed the formation of a single-phase tetrahedral structure of Ca2Ga2SiO7 with a P421m space group and no detectable impurity phase, indicating successful incorporation of Tm3+ ions into the host lattice. Under near-ultraviolet excitation of 355 nm, the phosphors exhibited intense blue emission centered at 455 nm. The emission peak is attributed to the 1D2 → 3F4 transition of Tm3+ ions. The concentration-dependent study revealed an optimal dopant level of 1.0 mol% of Tm3+, beyond which concentration quenching occurs. The chromaticity coordinates of the optimized phosphor fall in the ideal blue region of the CIE 1931 diagram, confirming its potential to emit white light when combined with red and green phosphors. Decay time analysis showed a reduction in lifetime with increasing dopant concentration, suggesting energy transfer between neighboring Tm3+ ions. The results demonstrate that Ca2Ga2SiO7:Tm3+ is a promising candidate for next-generation solid-state lighting applications.