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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
	2005-11-01
卷号	15期号:11页码:1883-1890
ISSN号	1616-301X
DOI	10.1002/adfm.200500092
通讯作者	Cheng, bc(bcheng@vip.sina.com)
英文摘要	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.
WOS关键词	ONE-DIMENSIONAL NANOSTRUCTURES ; WURTZITE ZNS ; SEMICONDUCTOR NANOWIRES ; THERMAL EVAPORATION ; RAMAN-SCATTERING ; CATALYTIC GROWTH ; LUMINESCENCE ; NANOCRYSTALS ; NANOPARTICLES ; STATES
WOS研究方向	Chemistry ; Science & Technology - Other Topics ; Materials Science ; Physics
WOS类目	Chemistry, Multidisciplinary ; Chemistry, Physical ; Nanoscience & Nanotechnology ; Materials Science, Multidisciplinary ; Physics, Applied ; Physics, Condensed Matter
语种	英语
出版者	WILEY-V C H VERLAG GMBH
WOS记录号	WOS:000233279500022
内容类型	期刊论文
URI标识	http://www.corc.org.cn/handle/1471x/2426359
专题	半导体研究所
通讯作者	Cheng, BC
作者单位	Chinese Acad Sci, Inst Semicond, Key Lab Semicond Mat Sci, Beijing 100083, Peoples R China
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.

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