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<p>This investigation examines Tb<sup>3+</sup>-doped Gd<sub>3</sub>Ce<sub>2</sub>Al<sub>3</sub>O<sub>12</sub> (Tb<sup>3+</sup>:GCAG) phosphors for white LED applications, highlighting their structural and optical advantages. Tb<sup>3+</sup> substitution for Gd<sup>3+</sup>, enabled by similar ionic radii, enhances crystallinity, reduces lattice distortion, and improves spectral output, as confirmed by X-ray diffraction. XPS confirms the chemical stability and the absence of Tb<sup>+4</sup> oxidation states. Optical studies reveal band gap modulation may be due to lattice strain. A concentration quenching is observed at green emission of Tb<sup>3+</sup>. Fluorescence lifetime increases from 0.176&#xa0;ms (undoped) to 0.681&#xa0;ms, with quantum yield of 59.13%. Emission spans blue, green and red wavelengths, driven by multipolar interactions, with optimized green emission at 546&#xa0;nm. The 0.1% Tb<sup>3+</sup>:GCAG phosphor achieving a CRI of 96 and chromaticity coordinates resembling natural daylight. The working prototype made using 0.1% Tb<sup>3+</sup>:GCAG and a UV chip demonstrates high-efficiency white light generation indicating strong potential for its use in white LED systems.</p>

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Synthesis and fluorescence studies of Tb3+ doped Gd3Ce2Al3O12 garnet phosphor for enhanced white light emission

  • 期刊论文

  • 发表日期：

    2026年2月12日

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  • Dewasthali Tejaswi Ramchandra,
  • Suman Rani

摘要

This investigation examines Tb3+-doped Gd3Ce2Al3O12 (Tb3+:GCAG) phosphors for white LED applications, highlighting their structural and optical advantages. Tb3+ substitution for Gd3+, enabled by similar ionic radii, enhances crystallinity, reduces lattice distortion, and improves spectral output, as confirmed by X-ray diffraction. XPS confirms the chemical stability and the absence of Tb+4 oxidation states. Optical studies reveal band gap modulation may be due to lattice strain. A concentration quenching is observed at green emission of Tb3+. Fluorescence lifetime increases from 0.176 ms (undoped) to 0.681 ms, with quantum yield of 59.13%. Emission spans blue, green and red wavelengths, driven by multipolar interactions, with optimized green emission at 546 nm. The 0.1% Tb3+:GCAG phosphor achieving a CRI of 96 and chromaticity coordinates resembling natural daylight. The working prototype made using 0.1% Tb3+:GCAG and a UV chip demonstrates high-efficiency white light generation indicating strong potential for its use in white LED systems.