Near-infrared-emitting colloidal Ag2S quantum dots exhibiting upconversion luminescence

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	Near-infrared-emitting colloidal Ag2S quantum dots exhibiting upconversion luminescence
	Zhang, Yanyan 1; Jiang, Danyu 2; Yang, Wei 1; Wang, Dandan 1; Zheng, Huiping 1; Du, Yuansheng 1; Li, Xi 1; Li, Qiang 1
刊名	SUPERLATTICES AND MICROSTRUCTURES
	2017-02-01
卷号	102 页码:512-516
关键词	Quantum dots Upconversion Near-infraed emission Surface Two photon absorption
英文摘要	Ag2S quantum dots (QDs) coated with thioglycolic acid (Ag2S QDs-TGA) have been synthesized in an organic solvent via a stepwise addition of reagents. When excited by a 980 nm laser, the near-infrared-emitting colloidal Ag2S QDs-TGA exhibit upconversion luminescence (UCL). The observed photoluminescence (PL) was attributed to the presence of ligand-modified Ag2S on the QD surfaces. Hence, upon dilution of the solution, the PL intensity initially increased before subsequently decreasing, accompanied by a blue shift in the PL spectra. The PL phenomena can be attributed to the increase in the amount of ligand-modified Ag2S on the QD surfaces upon dilution, which in turn affected the fluorescence resonance energy transfer (FRET) and re-emission of the surface energy level. The relations between the emission intensity of Ag2S QDs-TGA and the excitation power are investigated, and the results confirm that the UCL in Ag2S QDs-TGA can be ascribed to a two-photon-assisted absorption process via a real energy state. (C) 2016 Elsevier Ltd. All rights reserved.
WOS标题词	Science & Technology ; Physical Sciences
类目[WOS]	Physics, Condensed Matter
研究领域[WOS]	Physics
关键词[WOS]	ANTI-STOKES PHOTOLUMINESCENCE ; IN-VIVO ; FLUORESCENCE ; CDS ; NANOCRYSTALS ; ABSORPTION ; EXCITATION ; WATER
收录类别	SCI
语种	英语
WOS记录号	WOS:000394629000055
内容类型	期刊论文
源URL	[http://ir.sic.ac.cn/handle/331005/23714]
专题	上海硅酸盐研究所_无机材料分析测试中心_期刊论文
作者单位	1.East China Normal Univ, Sch Chem & Mol Engn, Shanghai 200062, Peoples R China 2.Chinese Acad Sci, Shanghai Inst Ceram, Shanghai 200050, Peoples R China
推荐引用方式 GB/T 7714	Zhang, Yanyan,Jiang, Danyu,Yang, Wei,et al. Near-infrared-emitting colloidal Ag2S quantum dots exhibiting upconversion luminescence[J]. SUPERLATTICES AND MICROSTRUCTURES,2017,102:512-516.
APA	Zhang, Yanyan.,Jiang, Danyu.,Yang, Wei.,Wang, Dandan.,Zheng, Huiping.,...&Li, Qiang.(2017).Near-infrared-emitting colloidal Ag2S quantum dots exhibiting upconversion luminescence.SUPERLATTICES AND MICROSTRUCTURES,102,512-516.
MLA	Zhang, Yanyan,et al."Near-infrared-emitting colloidal Ag2S quantum dots exhibiting upconversion luminescence".SUPERLATTICES AND MICROSTRUCTURES 102(2017):512-516.