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위조 방지 분야에 응용 가능한 다양한 희토류 이온이 도핑된 SrMoO<sub>4</sub> 형광체의 제조 및 특성
문태옥,정재용,조신호,Moon, Tae-Ok,Jung, Jae-Yong,Cho, Shinho 한국재료학회 2020 한국재료학회지 Vol.30 No.8
SrMoO<sub>4</sub>:RE<sup>3+</sup> (RE=Dy, Sm, Tb, Eu, Dy/Sm) phosphors are prepared by co-precipitation method. The effects of the type and the molar ratio of activator ions on the structural, morphological, and optical properties of the phosphor particles are investigated. X-ray diffraction data reveal that all the phosphors have a tetragonal system with a main (112) diffraction peak. The emission spectra of the SrMoO<sub>4</sub> phosphors doped with several activator ions indicate different multicolor emissions: strong yellow-emitting light at 573 nm for Dy<sup>3+</sup>, red light at 643 nm for Sm<sup>3+</sup>, green light at 545 nm for Tb<sup>3+</sup>, and reddish orange light at 614 nm for Eu<sup>3+</sup> activator ions. The Dy<sup>3+</sup> singly-doped SrMoO<sub>4</sub> phosphor shows two dominant emission peaks at 479 and 573 nm corresponding to the <sup>4</sup>F<sub>9/2</sub>→<sup>6</sup>H<sub>15/2</sub> magnetic dipole transition and <sup>4</sup>F<sub>9/2</sub>→<sup>6</sup>H<sub>13/2</sub> electric dipole transition, respectively. For Dy<sup>3+</sup> and Sm<sup>3+</sup> doubly-doped SrMoO<sub>4</sub> phosphors, two kinds of emission peaks are observed. The two emission peaks at 479 and 573 nm are attributed to <sup>4</sup>F<sub>9/2</sub>→<sup>6</sup>H<sub>15/2</sub> and <sup>4</sup>F<sub>9/2</sub>→<sup>6</sup>H<sub>13/2</sub> transitions of Dy<sup>3+</sup> and two emission bands centered at 599 and 643 nm are ascribed to <sup>4</sup>G<sub>5/2</sub>→<sup>6</sup>H<sub>7/2</sub> and <sup>4</sup>G<sub>5/2</sub>→<sup>6</sup>H<sub>9/2</sub> transitions of Sm<sup>3+</sup>. As the concentration of Sm<sup>3+</sup> increases from 1 to 5 mol%, the intensities of the emission bands of Dy<sup>3+</sup> gradually decrease; those of Sm<sup>3+</sup> slowly increase and reach maxima at 5 mol% of Sm<sup>3+</sup> ions, and then rapidly decrease with increasing molar ratio of Sm<sup>3+</sup> ions due to the concentration quenching effect. Fluorescent security inks based on as-prepared phosphors are synthesized and designed to demonstrate an anti-counterfeiting application.
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