Synthesis and optical properties of europium-doped ZnS: Long-lasting phosphorescence from aligned nanowires

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	Synthesis and optical properties of europium-doped ZnS: Long-lasting phosphorescence from aligned nanowires
	Cheng BC ; Wang ZG
刊名	advanced functional materials
	2005
卷号	15 期号:11 页码:1883-1890
关键词	ONE-DIMENSIONAL NANOSTRUCTURES
ISSN号	1616-301x
通讯作者	cheng, bc, chinese acad sci, inst semicond, key lab semicond mat sci, pob 912, beijing 100083, peoples r china. 电子邮箱地址: bcheng@vip.sina.com
中文摘要	quasi-aligned eu2+-doped wurtzite zns nanowires on au-coated si wafers have been successfully synthesized by a vapor deposition method under a weakly reducing atmosphere. compared with the undoped counterpart, incorporation of the dopant gives a modulated composition and crystal structure, which leads to a preferred growth of the nanowires along the [0110] direction and a high density of defects in the nanowire hosts. the ion doping causes intense fluorescence and persistent phosphorescence in zns nanowires. the dopant eu2+ ions form an isoelectronic acceptor level and yield a high density of bound excitions, which contribute to the appearance of the radiative recombination emission of the bound excitons and resonant raman scattering at higher pumping intensity. co-dopant cl- ions can serve not only as donors, producing a donor-acceptor pair transition with the eu2+ acceptor level, but can also form trap levels together with other defects, capture the photoionization electrons of eu2+, and yield long-lasting (about 4 min), green phosphorescence. with decreasing synthesis time, the existence of more surface states in the nanowires forms a higher density of trap centers and changes the crystal-field strength around eu2+. as a result, not only have an enhanced eu2+ -4f(6)5d(1)-4f(7) intra-ion transition and a prolonged afterglow time been more effectively observed (by decreasing the nanowires' diameters), but also the eu2+ related emissions are shifted to shorter wavelengths.
学科主题	半导体材料
收录类别	SCI
语种	英语
公开日期	2010-03-17
内容类型	期刊论文
源URL	[http://ir.semi.ac.cn/handle/172111/8416]
专题	半导体研究所_中国科学院半导体研究所（2009年前）
推荐引用方式 GB/T 7714	Cheng BC,Wang ZG. Synthesis and optical properties of europium-doped ZnS: Long-lasting phosphorescence from aligned nanowires[J]. advanced functional materials,2005,15(11):1883-1890.
APA	Cheng BC,&Wang ZG.(2005).Synthesis and optical properties of europium-doped ZnS: Long-lasting phosphorescence from aligned nanowires.advanced functional materials,15(11),1883-1890.
MLA	Cheng BC,et al."Synthesis and optical properties of europium-doped ZnS: Long-lasting phosphorescence from aligned nanowires".advanced functional materials 15.11(2005):1883-1890.