Using the first principle method,we investigate the influence of Sr/Ti ratio on the atomic structure and dislocation behavior of Sr_(n+1)TinO3_(n+1)(Ruddlesden–Popper phase)and Sr_(n)Ti_(n+1)O_(3n+2)(Magnéli pha...Using the first principle method,we investigate the influence of Sr/Ti ratio on the atomic structure and dislocation behavior of Sr_(n+1)TinO3_(n+1)(Ruddlesden–Popper phase)and Sr_(n)Ti_(n+1)O_(3n+2)(Magnéli phase).A linear lattice expansion versus the Sr/Ti ratio exhibits in the Ruddlesden–Popper and Magnéli phases.The Ruddlesden–Popper phase has lower formation energy and superior structural stability than the Magnéli phase.The two phases show different dislocation behaviors and it is found that a possibly preferred slip system<110>{110}emerges in the two phases,and the dislocations are more likely to dissociate into partial dislocations in Magnéli phases.展开更多
A series of Ce3＋, Tb3＋ or Ce3＋/Tb3＋ doped YA13（BO3）4 phosphors are synthesized by a high temperature solid-state reaction, and their luminescent properties are investigated. YA13（BO3）a：Ce3＋ shows a broad emi...A series of Ce3＋, Tb3＋ or Ce3＋/Tb3＋ doped YA13（BO3）4 phosphors are synthesized by a high temperature solid-state reaction, and their luminescent properties are investigated. YA13（BO3）a：Ce3＋ shows a broad emission band at 422 nm under the 367 nm radiation excitation. YA13（BO3）4：Tb3＋ can be efficiently excited by the ultraviolet （UV） light, and produces green emission. The emission intensity of YA13（BO3）4：Tb3＋ can be enhanced by adjusting Tb3＋ doped content, and reaches the maximum at 0.06 mol Tb3＋. When Ce3＋ is codoped, the emission intensity of Tb3＋ in YA13（BO3）4 can be enhanced, but the commission international del＇eclairage （CIE） chromaticity coordinates of YA13（BO3）4：Tb3＋ have almost no change. Moreover, the energy transfer from Ce3＋ to Tb3＋ in YA13（BO3）4 is studied.展开更多
基金the Special Fund for Theoretical Physics of the National Natural Science Foundation of China under Grant No 10847116the Postdoctoral Science Foundation of China under Grant No 20100480839+1 种基金the Natural Science Foundation of Hebei Province under Grant Nos A2010000184 and E2011201092the Natural Science Foundation of Hebei Province for Optoelectronic Materials Research Base under Grant No 08B007.
文摘Using the first principle method,we investigate the influence of Sr/Ti ratio on the atomic structure and dislocation behavior of Sr_(n+1)TinO3_(n+1)(Ruddlesden–Popper phase)and Sr_(n)Ti_(n+1)O_(3n+2)(Magnéli phase).A linear lattice expansion versus the Sr/Ti ratio exhibits in the Ruddlesden–Popper and Magnéli phases.The Ruddlesden–Popper phase has lower formation energy and superior structural stability than the Magnéli phase.The two phases show different dislocation behaviors and it is found that a possibly preferred slip system<110>{110}emerges in the two phases,and the dislocations are more likely to dissociate into partial dislocations in Magnéli phases.
基金This work has been supported by the Natural Science Foundation of Hebei Province in China （Nos.D2012201115 and A2011201010）, the Guide Project of University Science ＆ Technology Research in Hebei Province in China （No.Z2011266）, the Scientific Research Project of Hebei Province Education Department （No.20052021）, and the Guide Project of Bureau of Science and Technology of Baoding in Hebei Province in China （No. 12ZR057）.
文摘A series of Ce3＋, Tb3＋ or Ce3＋/Tb3＋ doped YA13（BO3）4 phosphors are synthesized by a high temperature solid-state reaction, and their luminescent properties are investigated. YA13（BO3）a：Ce3＋ shows a broad emission band at 422 nm under the 367 nm radiation excitation. YA13（BO3）4：Tb3＋ can be efficiently excited by the ultraviolet （UV） light, and produces green emission. The emission intensity of YA13（BO3）4：Tb3＋ can be enhanced by adjusting Tb3＋ doped content, and reaches the maximum at 0.06 mol Tb3＋. When Ce3＋ is codoped, the emission intensity of Tb3＋ in YA13（BO3）4 can be enhanced, but the commission international del＇eclairage （CIE） chromaticity coordinates of YA13（BO3）4：Tb3＋ have almost no change. Moreover, the energy transfer from Ce3＋ to Tb3＋ in YA13（BO3）4 is studied.
