인문학
사회과학
자연과학
공학
의약학
농수해양학
예술체육학
복합학
지원사업
학술연구/단체지원/교육 등 연구자 활동을 지속하도록 DBpia가 지원하고 있어요.
커뮤니티
연구자들이 자신의 연구와 전문성을 널리 알리고, 새로운 협력의 기회를 만들 수 있는 네트워킹 공간이에요.
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.
인공지능 문자 인식 모델을 통해 추출된 텍스트로, 일부 오타나 오류가 포함될 수 있으나 지속적으로 개선 중입니다.
오류를 발견하셨다면 해당 부분을 드래그한 후 ' 를 통해 신고해주세요.
오류를 발견하셨다면 해당 부분을 드래그한 후 ' 를 통해 신고해주세요.