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<p>The increasing demand for high-performance photonic devices has led to extensive studies on the optical properties of lanthanum cobalt oxide (LaCoO<sub>3</sub>). In this research, LaCoO<sub>3</sub> samples were successfully synthesized using the sol–gel technique and sintered at 700, 800, and 900&#xa0;°C to analyze the impact of temperature on structural and optical characteristics. Thermogravimetric analysis (TGA) confirmed the stability of the LaCoO<sub>3</sub> structure above 650&#xa0;°C, while X-ray diffraction (XRD) and Fourier-transform infrared spectroscopy (FTIR) validated the phase formation of a rhombohedral perovskite structure with an R-3c space group. Increasing the sintering temperature significantly enhanced crystallinity while reducing porosity, leading to improved optical properties. The emission spectra at 250 and 300&#xa0;nm revealed characteristic energy transitions from <sup>4</sup>T<sub>1</sub>g to <sup>4</sup>T<sub>1</sub>g (P), with the chromaticity diagram illustrating mixed-color components. These findings demonstrate that temperature-driven structural modifications play a crucial role in optimizing LaCoO<sub>3</sub> for potential photonic applications.</p>

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Temperature-driven enhancement of optical and dielectric properties of LaCoO3

  • 期刊论文

  • 发表日期：

    2026年2月13日

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  • Kamlash Rani,
  • Suman Rani

摘要

The increasing demand for high-performance photonic devices has led to extensive studies on the optical properties of lanthanum cobalt oxide (LaCoO3). In this research, LaCoO3 samples were successfully synthesized using the sol–gel technique and sintered at 700, 800, and 900 °C to analyze the impact of temperature on structural and optical characteristics. Thermogravimetric analysis (TGA) confirmed the stability of the LaCoO3 structure above 650 °C, while X-ray diffraction (XRD) and Fourier-transform infrared spectroscopy (FTIR) validated the phase formation of a rhombohedral perovskite structure with an R-3c space group. Increasing the sintering temperature significantly enhanced crystallinity while reducing porosity, leading to improved optical properties. The emission spectra at 250 and 300 nm revealed characteristic energy transitions from 4T1g to 4T1g (P), with the chromaticity diagram illustrating mixed-color components. These findings demonstrate that temperature-driven structural modifications play a crucial role in optimizing LaCoO3 for potential photonic applications.