Enhancement effect of illumination on the photoluminescence of water-soluble CdTe nanocrystals: Toward highly fluorescent CdTe/CdS core-shell structure

doi:10.1021/cm049172b

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	Enhancement effect of illumination on the photoluminescence of water-soluble CdTe nanocrystals: Toward highly fluorescent CdTe/CdS core-shell structure
	Bao, HB; Gong, YJ; Li, Z; Gao, MY
刊名	CHEMISTRY OF MATERIALS
	2004-10-05
卷号	16 期号:20 页码:3853-3859
ISSN号	0897-4756
DOI	10.1021/cm049172b
英文摘要	A strong photoluminescence enhancement effect of illumination on CdTe nanocrystals stabilized by thioglycolic acid (TGA) was observed. Under optimized conditions, the fluorescence quantum yield of CdTe nanocrystals in aqueous solution reached 85% at room temperature. Optical measurements indicated that the photodegradation of TGA rather than NCs was the main reason for the PL enhancement effect since sulfide ions released from TGA during illumination coordinated with cadmium ions on the surface of CdTe and formed a shell structure of CdS there. X-ray photoelectron spectroscopic results further proved the formation of CdS shell on the CdTe core during illumination. The colloidal solution of CdTe/ CdS core-shell nanocrystals with photoluminescence quantum yield higher than 80% turned out to be very stable. Therefore, the current investigations not only reveal the PL enhancement effect of illumination, but also provide a useful synthetic route for producing water-soluble and highly fluorescent CdTe/CdS core-shell nanocrystals.
语种	英语
出版者	AMER CHEMICAL SOC
WOS记录号	WOS:000224187600009
内容类型	期刊论文
源URL	[http://ir.iccas.ac.cn/handle/121111/55865]
专题	中国科学院化学研究所
通讯作者	Gao, MY
作者单位	Chinese Acad Sci, Inst Chem, Ctr Mol Sci, Key Lab Colloid Interface Sci & Chem Thermodynam, Beijing 100080, Peoples R China
推荐引用方式 GB/T 7714	Bao, HB,Gong, YJ,Li, Z,et al. Enhancement effect of illumination on the photoluminescence of water-soluble CdTe nanocrystals: Toward highly fluorescent CdTe/CdS core-shell structure[J]. CHEMISTRY OF MATERIALS,2004,16(20):3853-3859.
APA	Bao, HB,Gong, YJ,Li, Z,&Gao, MY.(2004).Enhancement effect of illumination on the photoluminescence of water-soluble CdTe nanocrystals: Toward highly fluorescent CdTe/CdS core-shell structure.CHEMISTRY OF MATERIALS,16(20),3853-3859.
MLA	Bao, HB,et al."Enhancement effect of illumination on the photoluminescence of water-soluble CdTe nanocrystals: Toward highly fluorescent CdTe/CdS core-shell structure".CHEMISTRY OF MATERIALS 16.20(2004):3853-3859.