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Royal Society of Chemistry (RSC) RSC Advances 13(34)
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    초록·키워드

    Tm<sup>3+</sup>; Yb<sup>3+</sup>:Zn<sub>2</sub>TiO<sub>4</sub> samples have been synthesized using a solid state reaction route. The phase, lattice parameters, crystallite size has been examined using X-ray Diffraction (XRD) and high resolution transmission electron microscopy (HRTEM). An intense peak of Yb<sup>3+</sup> codoped samples is observed near ∼957 nm due to the <sup>2</sup>F<sub>7/2</sub> → <sup>2</sup>F<sub>5/2</sub> transition in diffuse reflectance spectra (DRS), which confirms the presence of Yb<sup>3+</sup> ion in the prepared compound. The optical band gap of Yb<sup>3+</sup> codoped samples has been calculated using Kubelka-Munk function. The Raman spectra corresponds to incorporation of Tm<sup>3+</sup>/Yb<sup>3+</sup> at the octahedral and tetrahedral site of the spinel host. The emission spectra recorded by using 370 nm excitation wavelength shows intense blue colour band corresponding to the <sup>1</sup>G<sub>4</sub> → <sup>3</sup>H<sub>6</sub> transition of Tm<sup>3+</sup> ion. The upconversion (UC) emission spectra recorded by using 980 nm laser excitation source shows emission bands due to the <sup>1</sup>G<sub>4</sub> → <sup>3</sup>H<sub>6</sub>, <sup>1</sup>G<sub>4</sub> → <sup>3</sup>F<sub>4</sub> and <sup>3</sup>H<sub>4</sub> → <sup>3</sup>H<sub>6</sub> transitions of Tm<sup>3+</sup> ion in the host matrix lying in the blue, red and NIR regions respectively. There is effective enhancement of about ∼35 times in the blue UC emission intensity with incorporation of Yb<sup>3+</sup> at 3% doping concentration in the prepared sample. The anti-counterfeit application of the optimized upconverting phosphor has been successfully demonstrated.

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