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<p>This study reveals SrTiO<sub>3</sub> (STO) synthesized via the combustion method, characterized by inherent oxygen deficiency, and its photoluminescent properties upon doping with Samarium (Sm<sup>3+</sup>), resulting in a (STO:Sm<sup>3+)</sup> single-phase white-light-emitting phosphor. The crystallographic characteristics and morphological features of the prepared sample were studied using XRD and FE-SEM methods. The crystallite size of the doped samples is observed to be 10–15&#xa0;nm. The particles have a spherical morphology and are agglomerated. The presence of oxygen deficiency in the material’s lattice was confirmed using X-ray Photoelectron Spectroscopy, with the presence of a defective oxygen peak in the O1s Spectra, and the estimated oxygen vacancy fraction is 23%. Photoluminescence analysis was conducted to investigate defect formation and the luminescence behavior of STO:Sm<sup>3+</sup>.The blue emission observed in the photoluminescence study of host STO further confirms the presence of oxygen vacancies. The yellow (<sup>4</sup>G<sub>5/2</sub> → <sup>6</sup>H<sub>5/2</sub>), orange (<sup>4</sup>G<sub>5/2</sub> → <sup>6</sup>H<sub>7/2</sub>), and red (<sup>4</sup>G<sub>5/2</sub> → <sup>6</sup>H<sub>9/2</sub>) components of Samarium, together with blue emission from the host, yield white light. The photometric properties of the optimized sample were calculated. The CIE coordinates (0.3545, 0.3440) of the sample align well with those of a commercial white light-emitting phosphor. The sample shows a color purity (CP) of 9.06%, a color-rendering index (CRI) of 83, a correlated color temperature (CCT) value of 4605&#xa0;K, and an impressive quantum yield of 50.24%. These studies imply that the oxygen-deficient Samarium-doped SrTiO<sub>3</sub> phosphor is a potential candidate for single-phase wLEDs.</p>

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Defect-induced Samarium-activated SrTiO3 for wLED applications and photometric studies

  • 期刊论文

  • 发表日期：

    2026年5月14日

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  • K. Greeshma,
  • S. S. Ancy,
  • S. V. Sajith,
  • A. M. Huda Thasneem,
  • K. M. Nissamudeen

摘要

This study reveals SrTiO3 (STO) synthesized via the combustion method, characterized by inherent oxygen deficiency, and its photoluminescent properties upon doping with Samarium (Sm3+), resulting in a (STO:Sm3+) single-phase white-light-emitting phosphor. The crystallographic characteristics and morphological features of the prepared sample were studied using XRD and FE-SEM methods. The crystallite size of the doped samples is observed to be 10–15 nm. The particles have a spherical morphology and are agglomerated. The presence of oxygen deficiency in the material’s lattice was confirmed using X-ray Photoelectron Spectroscopy, with the presence of a defective oxygen peak in the O1s Spectra, and the estimated oxygen vacancy fraction is 23%. Photoluminescence analysis was conducted to investigate defect formation and the luminescence behavior of STO:Sm3+.The blue emission observed in the photoluminescence study of host STO further confirms the presence of oxygen vacancies. The yellow (4G5/2 → 6H5/2), orange (4G5/2 → 6H7/2), and red (4G5/2 → 6H9/2) components of Samarium, together with blue emission from the host, yield white light. The photometric properties of the optimized sample were calculated. The CIE coordinates (0.3545, 0.3440) of the sample align well with those of a commercial white light-emitting phosphor. The sample shows a color purity (CP) of 9.06%, a color-rendering index (CRI) of 83, a correlated color temperature (CCT) value of 4605 K, and an impressive quantum yield of 50.24%. These studies imply that the oxygen-deficient Samarium-doped SrTiO3 phosphor is a potential candidate for single-phase wLEDs.