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<p>Pure and aluminium-doped strontium oxide (SrO) powders (1–4 wt%) were synthesised via the sol-gel method. X-ray diffraction confirmed the formation of a phase-pure cubic structure, and the crystallite size increased on Al doping. SEM images revealed agglomerated particles due to high surface energy and strong interparticle cohesion forces. UV-Vis analyses showed a gradual widening of the optical band gap with increased Al concentration, indicating improved electronic structure and reduced defects. FTIR spectra confirmed the presence of characteristic functional groups. XPS studies verified the successful substitution of Al into the SrO lattice and the creation of oxygen vacancies, which acted as luminescent centres. Under 330&#xa0;nm excitation, the samples exhibited near-band-edge fluorescence emission, while a bluish-green long-lasting afterglow was observed under 360&#xa0;nm excitation due to vacancy-related trap levels. Among all compositions, SrO: Al (3 wt%) has the highest emission intensity and thermal stability, whereas higher doping (4 wt%) has concentration quenching. These fluorescence and phosphorescent properties highlight Al-doped SrO as a prominent material for UV-excited phosphors, solid-state lighting, display technologies, optical data storage, and sensing applications. Dielectric studies revealed low dielectric constants at high frequencies, indicating reduced power loss and positioning Al-doped SrO powders as promising candidates for power systems and solar-energy-related technologies.</p>

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Structural, Optical, Thermal and Dielectric Characterisation of Aluminium-Doped Strontium Oxide Powders

  • 期刊论文

  • 发表日期：

    2026年3月3日

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  • Meenakshi R,
  • Jisha V.T.,
  • Shyju G.J.,
  • Jayasree K

摘要

Pure and aluminium-doped strontium oxide (SrO) powders (1–4 wt%) were synthesised via the sol-gel method. X-ray diffraction confirmed the formation of a phase-pure cubic structure, and the crystallite size increased on Al doping. SEM images revealed agglomerated particles due to high surface energy and strong interparticle cohesion forces. UV-Vis analyses showed a gradual widening of the optical band gap with increased Al concentration, indicating improved electronic structure and reduced defects. FTIR spectra confirmed the presence of characteristic functional groups. XPS studies verified the successful substitution of Al into the SrO lattice and the creation of oxygen vacancies, which acted as luminescent centres. Under 330 nm excitation, the samples exhibited near-band-edge fluorescence emission, while a bluish-green long-lasting afterglow was observed under 360 nm excitation due to vacancy-related trap levels. Among all compositions, SrO: Al (3 wt%) has the highest emission intensity and thermal stability, whereas higher doping (4 wt%) has concentration quenching. These fluorescence and phosphorescent properties highlight Al-doped SrO as a prominent material for UV-excited phosphors, solid-state lighting, display technologies, optical data storage, and sensing applications. Dielectric studies revealed low dielectric constants at high frequencies, indicating reduced power loss and positioning Al-doped SrO powders as promising candidates for power systems and solar-energy-related technologies.