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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
Source PublicationSuperlattices and Microstructures
ISSN07496036
Volume102Pages:512-516
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. © 2016 Elsevier Ltd
DOI10.1016/j.spmi.2016.11.060
EI Accession Number20170303261790
EI KeywordsSilver compounds
EI Classification Number714.2 Semiconductor Devices and Integrated Circuits - 761 Nanotechnology - 801.4 Physical Chemistry - 931.3 Atomic and Molecular Physics - 951 Materials Science
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Cited Times:5[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.sic.ac.cn/handle/331005/25743
Collection中国科学院上海硅酸盐研究所
Affiliation1.School of Chemistry and Molecular Engineering, East China Normal University, Shanghai; 200062, China;
2.Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai; 200050, 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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