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<p>Here we report that Sm<sup>3+</sup>-ion activated SrMoO<sub>4</sub> orange light emitting phosphors were synthesized by conventional solid-state method. All the phosphor materials are crystallized in a tetragonal structure with space group <i>I4</i><sub><i>1</i></sub><i>/a</i> (No. 88). Photoluminescence study reveals that, on excitation at λ<sub>ex</sub> 404 nm, the distinctive emission peaks located at 561, 596, 644, and 703 nm, corresponding to the electronic transition <sup>4</sup>G<sub>5/2</sub> → <sup>6</sup>H<sub>5/2,</sub> <sup>4</sup>G<sub>5/2</sub> → <sup>6</sup>H<sub>7/2,</sub> <sup>4</sup>G<sub>5/2</sub> → <sup>6</sup>H<sub>9/2</sub> and <sup>4</sup>G<sub>5/2</sub> → <sup>6</sup>H<sub>11/2</sub>, respectively. The room temperature decay measurement results suggest that Sm<sup>3+</sup> ion activated SrMoO<sub>4</sub> phosphor exhibits, which have a long life are of the order of milliseconds (τ = 0.6546 ms). The Sr<sub>0.99</sub>Sm<sub>0.01</sub>MoO<sub>4</sub> (CP = 72.89%, CCT = 1714 K) has the highest PL emission intensity with quantum yield 9.37%. Further, using polyvinyl alcohol (PVA) as a matrix and optimised phosphor Sr<sub>0.99</sub>Sm<sub>0.01</sub>MoO<sub>4</sub>, a low-cost, environmentally benign luminescent security ink was created to determine currency forgeries. The synthesized orange-light emitting multifunctional Sr<sub>0.99</sub>Sm<sub>0.01</sub>MoO<sub>4</sub> phosphor can be used for solid-state lighting, demonstrated luminescent flexible films, anti-counterfeiting and forensic applications.</p>

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Sm3+ activated SrMoO4 orange-red phosphors: applications in luminescent flexible films, fingerprint identification and anti-counterfeiting

  • 期刊论文

  • 发表日期：

    2025年11月3日

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  • C. Lakshmi Ranganatha,
  • B. S. Palakshamurthy,
  • H. M. Suresh Kumar,
  • G. P. Abhilash,
  • Anu Mathew,
  • C. Shivakumara

摘要

Here we report that Sm3+-ion activated SrMoO4 orange light emitting phosphors were synthesized by conventional solid-state method. All the phosphor materials are crystallized in a tetragonal structure with space group I41/a (No. 88). Photoluminescence study reveals that, on excitation at λex 404 nm, the distinctive emission peaks located at 561, 596, 644, and 703 nm, corresponding to the electronic transition 4G5/2 → 6H5/2, 4G5/2 → 6H7/2, 4G5/2 → 6H9/2 and 4G5/2 → 6H11/2, respectively. The room temperature decay measurement results suggest that Sm3+ ion activated SrMoO4 phosphor exhibits, which have a long life are of the order of milliseconds (τ = 0.6546 ms). The Sr0.99Sm0.01MoO4 (CP = 72.89%, CCT = 1714 K) has the highest PL emission intensity with quantum yield 9.37%. Further, using polyvinyl alcohol (PVA) as a matrix and optimised phosphor Sr0.99Sm0.01MoO4, a low-cost, environmentally benign luminescent security ink was created to determine currency forgeries. The synthesized orange-light emitting multifunctional Sr0.99Sm0.01MoO4 phosphor can be used for solid-state lighting, demonstrated luminescent flexible films, anti-counterfeiting and forensic applications.