Luminescent properties of rare earth ions in one-dimensional oxide nanowires

	Luminescent properties of rare earth ions in one-dimensional oxide nanowires
	Song H. W.; Yu L. X.; Yang L. M.; Lu S. Z.
	2005
发表期刊	Journal of Nanoscience and Nanotechnology
ISSN	1533-4880
卷号	5 期号:9 页码:1519-1531
摘要	Rare-earth doped one-dimensional oxide nanowires including LaPO(4), La(2)O(3), and Gd(2)O(3) were synthesized by the hydrothermal method. Their luminescent properties including local environments, electronic transitions, energy transfer, and frequency up-conversion luminescence processes were systematically studied. In LaPO(4):Eu and La(2)O(3):Eu nanowires, different symmetry sites of Eu(3+) ions were identified, which obviously differed from those of the corresponding micrometer-sized particles. This was attributed to crystal field degeneration in the fringe along the length axis. In LaPO(4):Eu nanowires, the electronic transition rate of (5)D(1)-Sigma(7)(J)F(J) increased similar to 2 times over that of the zero-dimensional nanoparticles and micrometer-sized particles, which was related to the variation of dipole field induced by shape anisotropy. Considering the nonradiative relaxations, meanwhile, the luminescent quantum efficiency for (5)D(1)-Sigma(7)(J)F(J) transitions of Eu(3+) in nanowires increased 100% over that in nanoparticles and 20% over that in micrometer particles. In Gd(2)O(3):Eu(3+), LaPO(4):Ce(3+), and LaPO(4):Tb(3+) nanowires and micrometer-sized particles, the electronic transition rate of rare earths had only a little variation. In LaPO(4):Ce(3+)/Tb(3+) nanowires, the energy transfer rate of Ce(3+) --> Tb(3+) decreased 3 times compared to that in micrometer rods. Despite this, the brightness for the (5)D(4) (7)F(5) green emissions of Tb(3+) increased several times due to decreased energy transfer from the excited states higher than (5)D(4) to some defect levels. In Gd(2)O(3):Er(3+)/Yb(3+) nanocrystals, as the shape varied from nanopapers to nanowires, the relative intensity of up-conversion luminescence of (2)H(11/2) /(4)S(3/2) -(4)I(15/2) and (4)F(9/2)- (4)I(15/2) to the infrared down-conversion luminescence of (4)I(13/2) - (4)I(15/2) increased remarkably, indicating efficient up-conversion luminescence. Our present results indicate that rare-earth-doped oxide nanowires is a type of new and efficient phosphors.
收录类别	SCI ; EI
语种	英语
文献类型	期刊论文
条目标识符	http://ir.ciomp.ac.cn/handle/181722/34393
专题	中科院长春光机所知识产出
推荐引用方式 GB/T 7714	Song H. W.,Yu L. X.,Yang L. M.,et al. Luminescent properties of rare earth ions in one-dimensional oxide nanowires[J]. Journal of Nanoscience and Nanotechnology,2005,5(9):1519-1531.
APA	Song H. W.,Yu L. X.,Yang L. M.,&Lu S. Z..(2005).Luminescent properties of rare earth ions in one-dimensional oxide nanowires.Journal of Nanoscience and Nanotechnology,5(9),1519-1531.
MLA	Song H. W.,et al."Luminescent properties of rare earth ions in one-dimensional oxide nanowires".Journal of Nanoscience and Nanotechnology 5.9(2005):1519-1531.

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