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<p>A facile and economical urea-assisted solution combustion approach was employed to prepare Er<sup>3+</sup>-doped Gd<sub>2</sub>Zr<sub>2</sub>O<sub>7</sub> (GdZO:Er) nanophosphors in a single step. Unlike previous reports that focused mainly on upconversion emission in this host lattice, the present study highlights the down conversion photoluminescence behaviour of Er<sup>3+</sup> ions under near-UV excitation for efficient green emission. XRD analysis of prepared samples confirmed the formation of a single-phase disordered fluorite structure with space group <InlineEquation ID="IEq1"> <EquationSource Format="TEX">\(Fm\overline{3}m\)</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <mi>F</mi> <mi>m</mi> <mover> <mn>3</mn> <mo>¯</mo> </mover> <mi>m</mi> </mrow> </math></EquationSource> </InlineEquation>. FE-SEM and TEM analyses revealed that the synthesized particles were nearly spherical and uniformly distributed. EDAX analysis was done to determine elemental composition and confirm the incorporation of Er<sup>3+</sup> ions into the host lattice. The optical band gap of GdZO:<i>x</i>Er<sup>3+</sup>(<i>x</i> = 1–5 mol%) nanophosphors was determined using diffuse reflectance spectroscopy (DRS).Photoluminescence experiments under 376 nm excitation displayed strong green emission at 548 nm (<sup>4</sup>S<sub>3/2</sub> → <sup>4</sup>I<sub>15/2</sub>) of the Er<sup>3+</sup> ions. It was determined that the intensity of emission also rose with the concentration of doping up to 3 mol% and then reduced with the concentration, as a result of the concentration quenching, which was ascribed to the enhanced non-radiative energy exchange between the closely spaced Er<sup>3+</sup> ions. Chromaticity coordinates, correlated color temperature (CCT), and color purity (CP) were evaluated based on the CIE 1931 standard, confirming green emission with high color purity. The optimized sample exhibited CIE chromaticity coordinates of (0.338, 0.644), a correlated color temperature (CCT) of 5430 K, and a maximum color purity of 84.47%. These findings demonstrate that Er<sup>3+</sup>-doped Gd<sub>2</sub>Zr<sub>2</sub>O<sub>7</sub> nanophosphors are promising green-emitting materials for applications in display technologies, solid-state lighting, and advanced photonic devices.</p>

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Urea-assisted synthesis of Er3+-doped Gd2Zr2O7 nanocrystalline phosphors for photonic applications

  • 期刊论文

  • 发表日期：

    2026年7月4日

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  • Mahesh Matoria,
  • Deepika Dhaterwal,
  • Annu Dalal,
  • Ritu Langyan,
  • Avni Khatkar,
  • S. P. Khatkar,
  • Surender Kumar,
  • Sonika Singh

摘要

A facile and economical urea-assisted solution combustion approach was employed to prepare Er3+-doped Gd2Zr2O7 (GdZO:Er) nanophosphors in a single step. Unlike previous reports that focused mainly on upconversion emission in this host lattice, the present study highlights the down conversion photoluminescence behaviour of Er3+ ions under near-UV excitation for efficient green emission. XRD analysis of prepared samples confirmed the formation of a single-phase disordered fluorite structure with space group \(Fm\overline{3}m\) F m 3 ¯ m . FE-SEM and TEM analyses revealed that the synthesized particles were nearly spherical and uniformly distributed. EDAX analysis was done to determine elemental composition and confirm the incorporation of Er3+ ions into the host lattice. The optical band gap of GdZO:xEr3+(x = 1–5 mol%) nanophosphors was determined using diffuse reflectance spectroscopy (DRS).Photoluminescence experiments under 376 nm excitation displayed strong green emission at 548 nm (4S3/2 → 4I15/2) of the Er3+ ions. It was determined that the intensity of emission also rose with the concentration of doping up to 3 mol% and then reduced with the concentration, as a result of the concentration quenching, which was ascribed to the enhanced non-radiative energy exchange between the closely spaced Er3+ ions. Chromaticity coordinates, correlated color temperature (CCT), and color purity (CP) were evaluated based on the CIE 1931 standard, confirming green emission with high color purity. The optimized sample exhibited CIE chromaticity coordinates of (0.338, 0.644), a correlated color temperature (CCT) of 5430 K, and a maximum color purity of 84.47%. These findings demonstrate that Er3+-doped Gd2Zr2O7 nanophosphors are promising green-emitting materials for applications in display technologies, solid-state lighting, and advanced photonic devices.