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6 results on '"Cao, Wang"'

2. Effect of Dy dopant on the ferromagnetic characteristics of indium nitride nanosheets

Author

Qing Lu, Fei Xing, Guangchao Yin, Yu-Ping Sun, Cao Wang, and Qiang Jing

Subjects
Indium nitride, Materials science, Spintronics, Dopant, Ferromagnetic material properties, Mechanical Engineering, Doping, Analytical chemistry, 02 engineering and technology, 010402 general chemistry, 021001 nanoscience & nanotechnology, Condensed Matter Physics, 01 natural sciences, 0104 chemical sciences, Condensed Matter::Materials Science, chemistry.chemical_compound, Ferromagnetism, chemistry, Mechanics of Materials, Condensed Matter::Strongly Correlated Electrons, General Materials Science, 0210 nano-technology, Nitriding, Nanosheet
Abstract

Herein, Dy3+ doped indium nitride nanosheets with ferromagnetism at room-temperature were synthesized via a vapor - solid phase nitriding reaction. The as-synthesized samples exhibit clear ferromagnetism at room-temperature. The ferromagnetic properties of the samples could be changed by doped Dy3+. The saturation magnetization value of various Dy3+ doped indium nitride nanosheet samples display a parabolic-like change with the Dy3+ doped content increase and reaches the top value of 0.1455 emu g−1 corresponding to the Dy3+ doped content of 1.06 at. % at room temperature. The magnetic properties were originated from the d-f interaction between localized carriers and adjacent rare earth Dy3+ ions in the carrier orbits based on the first-principles calculation. The as-synthesized Dy doped indium nitride nanosheets can be widely used in spintronic devices due to the room temperature ferromagnetism.

Published
2021

6. Up-conversion luminescence of trivalent-rare-earth ion-doped LnTaO4 (Ln=Y, Gd, La)

Author

Pang, Tao, Cao, Wang-he, Fu, Yao, and Luo, Xi-xian

Subjects
*IONS, *LUMINESCENCE, *DIODES, *RARE earth metals
Abstract

Abstract: The up-conversion luminescence properties of trivalent-rare-earth ion-doped orthotantalates are studied under 980 nm laser diode excitation. The results indicate that YTaO4:Tm3+/Yb3+ emits blue and strong infrared emissions respectively corresponding to 1G4→3H6 and 3H4→3H6 transitions of Tm3+ ions, while YTaO4:Er3+/Yb3+ produces strong green and weak red emissions, resulting from 2H11/2/4S3/2→4I15/2 and 4F9/2→4I15/2 transitions of Er3+ ions, respectively. In contrast to three excellent up-conversion phosphors, viz. NaYF4:Er3+/Yb3+, Y2O2S:Er3+/Yb3+ and Y2O3:Er3+, YTaO4:Er3+/Yb3+ shows not only strong green emission, but also larger intensity ratio of green to red emission. In addition, it is found that LaTaO4: Er3+/Yb3+ shows the minimum quenching concentration of Yb3+ and weakest up-conversion emission intensity, and the main peak presents blue shift (8 nm/556 nm) as compared with YTaO4:Er3+/Yb3+ and GdTaO4:Er3+/Yb3+. The distinct luminescent characteristics of LaTaO4: Er3+/Yb3+ can be attributed to the larger difference of radius between doped ion and La3+ ion. [Copyright &y& Elsevier]

Published
2008
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