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<p>We present the synthesis and comprehensive characterization of SiO<sub>2</sub>-coated CaTiO<sub>3</sub>:Yb<sup>3+</sup>,Er<sup>3+</sup> upconversion phosphors (CaTiO<sub>3</sub>:Yb<sup>3+</sup>,Er<sup>3+</sup>@SiO<sub>2</sub> UCPs). The core CaTiO<sub>3</sub>:Yb<sup>3+</sup>,Er<sup>3+</sup> particles were fabricated via a high-energy wet ball-milling method, followed by surface modification with a SiO<sub>2</sub> shell. X-ray diffraction (XRD) analysis confirmed that the diffraction patterns of the synthesized samples matched well with those of the orthorhombic CaTiO<sub>3</sub>. Transmission electron microscopy (TEM) revealed a uniform silica coating surrounding the CaTiO<sub>3</sub>:Yb<sup>3+</sup>,Er<sup>3+</sup> cores with a thickness of a few nanometers. Under 980&#xa0;nm excitation, the photoluminescence spectra exhibited strong green emissions corresponding to the <sup>4</sup>S<sub>3/2</sub>/<sup>2</sup>H<sub>11/2</sub> → <sup>4</sup>I<sub>15/2</sub> transitions and weaker red emission from the <sup>4</sup>F<sub>9/2</sub> → <sup>4</sup>I<sub>15/2</sub> transition. Cytotoxicity evaluation using MDA-MB-231 breast cancer cells showed over 80% viability at a sample concentration of 40&#xa0;μg/mL after 48&#xa0;h, indicating good biocompatibility. These results suggest that CaTiO<sub>3</sub>:Yb<sup>3+</sup>,Er<sup>3+</sup>@SiO<sub>2</sub> UCPs are promising candidates for bioimaging applications.</p>

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Fabrication and optical characterization of SiO2-coated CaTiO3: Yb3+, Er3+ upconversion materials for bioimaging

  • 期刊论文

  • 发表日期：

    2025年10月22日

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  • Da Yong Kim,
  • Eswaran Swetha,
  • Woong Kim,
  • Seok-Jun Kim,
  • Gyeong Bok. Jung

摘要

We present the synthesis and comprehensive characterization of SiO2-coated CaTiO3:Yb3+,Er3+ upconversion phosphors (CaTiO3:Yb3+,Er3+@SiO2 UCPs). The core CaTiO3:Yb3+,Er3+ particles were fabricated via a high-energy wet ball-milling method, followed by surface modification with a SiO2 shell. X-ray diffraction (XRD) analysis confirmed that the diffraction patterns of the synthesized samples matched well with those of the orthorhombic CaTiO3. Transmission electron microscopy (TEM) revealed a uniform silica coating surrounding the CaTiO3:Yb3+,Er3+ cores with a thickness of a few nanometers. Under 980 nm excitation, the photoluminescence spectra exhibited strong green emissions corresponding to the 4S3/2/2H11/2 → 4I15/2 transitions and weaker red emission from the 4F9/2 → 4I15/2 transition. Cytotoxicity evaluation using MDA-MB-231 breast cancer cells showed over 80% viability at a sample concentration of 40 μg/mL after 48 h, indicating good biocompatibility. These results suggest that CaTiO3:Yb3+,Er3+@SiO2 UCPs are promising candidates for bioimaging applications.