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<p>In this work, we prepared Chromium(III) tris(8-hydroxyquinoline) (CrQ₃) nanoparticles (NPs) using a simple precipitation method and systematically characterized to examine the structural and optical features relevant to plasmon–enhanced nanophotonic applications. The crystallinity of the coordination compound was confirmed using powder X-ray diffraction (PXRD), and scanning electron microscopy (SEM) showed aggregated grains at the nanoscale. Transmission electron microscopy (TEM), high-resolution transmission electron microscopy (HRTEM), and selected area electron diffraction (SAED) investigations validated the synthesis of crystalline quasi-spherical nanoparticles with partial agglomeration and an average particle size of 23.2 ± 3.6&#xa0;nm. UV-visible absorption spectrum showed a strong UV absorbance band at 247&#xa0;nm, which is ascribed to a plasmon-compatible optical response probably originating from coupling between ligand-centred and metal-centred electronic states. The estimated shallow penetration depth in the UV region reflects localization of the electromagnetic field and a significant light-matter interaction within plasmon-compatible materials. Optical bandgap analysis revealed a wide bandgap of 4.46&#xa0;eV and the Urbach energy of 0.83&#xa0;eV, indicating the presence of defect-induced localized states that contribute to sub-bandgap absorption. The photoluminescence analysis showed excitation-dependent emission in the green (516&#xa0;nm) to near-infrared (784&#xa0;nm) ranges, suggesting multiple emissive pathways suitable for plasmon-exciton coupling. The integrated optical confinement, plasmon-like UV response, and tunable emission properties make CrQ<sub>3</sub> nanoparticles a promising active material in plasmon-enhanced photonic devices, such as ultraviolet photodetectors, plasmon-enhanced light emitters and hybrid plasmonic-organic nanoparticles.</p>

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Plasmon-Compatible Ultraviolet Optical Response and Excitation-Tunable Emission in Chromium(III) Tris(8-Hydroxyquinoline) Nanoparticles

  • 期刊论文

  • 发表日期：

    2026年4月1日

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  • V. Bharathi Devi,
  • J. Christina Rhoda,
  • Helen Merina Albert,
  • Santosh Kumar Nathsharma,
  • P. Divya,
  • J. P. Suchitra

摘要

In this work, we prepared Chromium(III) tris(8-hydroxyquinoline) (CrQ₃) nanoparticles (NPs) using a simple precipitation method and systematically characterized to examine the structural and optical features relevant to plasmon–enhanced nanophotonic applications. The crystallinity of the coordination compound was confirmed using powder X-ray diffraction (PXRD), and scanning electron microscopy (SEM) showed aggregated grains at the nanoscale. Transmission electron microscopy (TEM), high-resolution transmission electron microscopy (HRTEM), and selected area electron diffraction (SAED) investigations validated the synthesis of crystalline quasi-spherical nanoparticles with partial agglomeration and an average particle size of 23.2 ± 3.6 nm. UV-visible absorption spectrum showed a strong UV absorbance band at 247 nm, which is ascribed to a plasmon-compatible optical response probably originating from coupling between ligand-centred and metal-centred electronic states. The estimated shallow penetration depth in the UV region reflects localization of the electromagnetic field and a significant light-matter interaction within plasmon-compatible materials. Optical bandgap analysis revealed a wide bandgap of 4.46 eV and the Urbach energy of 0.83 eV, indicating the presence of defect-induced localized states that contribute to sub-bandgap absorption. The photoluminescence analysis showed excitation-dependent emission in the green (516 nm) to near-infrared (784 nm) ranges, suggesting multiple emissive pathways suitable for plasmon-exciton coupling. The integrated optical confinement, plasmon-like UV response, and tunable emission properties make CrQ3 nanoparticles a promising active material in plasmon-enhanced photonic devices, such as ultraviolet photodetectors, plasmon-enhanced light emitters and hybrid plasmonic-organic nanoparticles.