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Near-infrared-emitting colloidal Ag2S quantum dots exhibiting upconversion luminescence
Zhang, Yanyan1; Jiang, Danyu2; Yang, Wei1; Wang, Dandan1; Zheng, Huiping1; Du, Yuansheng1; Li, Xi1; Li, Qiang1
2017-02-01
Source PublicationSUPERLATTICES AND MICROSTRUCTURES
Volume102Pages:512-516
SubtypeArticle
AbstractAg2S 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.
KeywordQuantum Dots Upconversion Near-infraed Emission Surface Two Photon Absorption
WOS HeadingsScience & Technology ; Physical Sciences
DOI10.1016/j.spm12016.11.060
WOS KeywordANTI-STOKES PHOTOLUMINESCENCE ; IN-VIVO ; FLUORESCENCE ; CDS ; NANOCRYSTALS ; ABSORPTION ; EXCITATION ; WATER
Indexed BySCI
Language英语
WOS Research AreaPhysics
WOS SubjectPhysics, Condensed Matter
WOS IDWOS:000394629000055
Citation statistics
Cited Times:5[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.sic.ac.cn/handle/331005/23714
Collection无机材料分析测试中心_期刊论文
Affiliation1.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
Recommended Citation
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.
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