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<p>An intense red-emissive Eu<sup>3+</sup>-doped (1&#xa0;mol%) and Bi<sup>3+</sup> co-doped (1–5&#xa0;mol%) Y<sub>2</sub>O<sub>3</sub> nanophosphors series were made using a urea-assisted solution combustion method and characterized using XRD, XPS, PL, SEM, and TEM. The nanophosphors exhibit emission under near-UV excitation (<sup>5</sup>D<sub>0</sub> → <sup>7</sup>F<sub>2</sub> transition of Eu<sup>3+</sup>), significantly enhanced through Bi<sup>3+</sup>-mediated energy transfer, with emission intensity and transfer efficiency tunable via Bi<sup>3+</sup> concentration. A PVA–chitosan film incorporated with red nanophosphor was fabricated, resulting in a stable, flexible, and waterproof film, providing safe, concealed luminescent materials. Also, the optimized Y<sub>2</sub>O<sub>3</sub>:Eu<sup>3+</sup>(1&#xa0;mol%): Bi<sup>3+</sup>(5&#xa0;mol%) phosphor was functionalized for latent fingerprint imaging under 395&#xa0;nm UV light, as well as a PVA-transparent anti-counterfeiting ink tried on various substrates, resulting in high-contrast, sensitive patterns. This work emphasizes the multifunctional pertinency of the nanophosphors, signifying the possibility for anti-counterfeiting, forensic finding, integrated optics, optical communications, and solid-state lighting.</p>

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Photo-physical attribute of red-emissive Y2O3: Eu3+: Bi3+ application in anti-counterfeiting, latent fingerprints, and transparent-flexible noncrystalline encased in PVA/CS film

  • 期刊论文

  • 发表日期：

    2026年3月5日

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  • Renu,
  • Nitika Mor,
  • Jitender,
  • Bharti Dahiya,
  • Heena Dahiya

摘要

An intense red-emissive Eu3+-doped (1 mol%) and Bi3+ co-doped (1–5 mol%) Y2O3 nanophosphors series were made using a urea-assisted solution combustion method and characterized using XRD, XPS, PL, SEM, and TEM. The nanophosphors exhibit emission under near-UV excitation (5D0 → 7F2 transition of Eu3+), significantly enhanced through Bi3+-mediated energy transfer, with emission intensity and transfer efficiency tunable via Bi3+ concentration. A PVA–chitosan film incorporated with red nanophosphor was fabricated, resulting in a stable, flexible, and waterproof film, providing safe, concealed luminescent materials. Also, the optimized Y2O3:Eu3+(1 mol%): Bi3+(5 mol%) phosphor was functionalized for latent fingerprint imaging under 395 nm UV light, as well as a PVA-transparent anti-counterfeiting ink tried on various substrates, resulting in high-contrast, sensitive patterns. This work emphasizes the multifunctional pertinency of the nanophosphors, signifying the possibility for anti-counterfeiting, forensic finding, integrated optics, optical communications, and solid-state lighting.