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Journal of Materials Science

, Volume 52, Issue 16, pp 9424–9429 | Cite as

Near-infrared-emitting colloidal Ag2S quantum dots excited by an 808 nm diode laser

  • Yanyan Zhang
  • Jinfeng Xia
  • Caixia Li
  • Guohong Zhou
  • Wei Yang
  • Dandan Wang
  • Huiping Zheng
  • Yuansheng Du
  • Xi Li
  • Qiang LiEmail author
Chemical routes to materials

Abstract

Thioglycolic acid (TGA)-coated colloidal Ag2S quantum dots (QDs) emitting in the near-infrared (NIR) region upon excitation by an 808 nm diode laser were synthesized. The observed photoluminescence (PL) was attributed to the presence of ligand-modified Ag2S on the QD surfaces and could be easily controlled by a simple dilution process due to the concentration-dependent surface structure of the colloidal QDs. Upon dilution of the solution, the PL intensity initially increased before later decreasing, with a blueshift being observed in the PL spectra. These phenomena can be accounted for by the aggregation of QDs due to a decrease in the content 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.

Keywords

Fluorescence Resonance Energy Transfer Indocyanine Green Ag2S Thioglycolic Acid Increase Ligand Absorption 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer Science+Business Media New York 2017

Authors and Affiliations

  • Yanyan Zhang
    • 1
  • Jinfeng Xia
    • 2
  • Caixia Li
    • 3
  • Guohong Zhou
    • 2
  • Wei Yang
    • 1
  • Dandan Wang
    • 1
  • Huiping Zheng
    • 1
  • Yuansheng Du
    • 1
  • Xi Li
    • 1
  • Qiang Li
    • 1
    Email author
  1. 1.Department of ChemistryEast China Normal UniversityShanghaiPeople’s Republic of China
  2. 2.Shanghai Institute of CeramicsChinese Academy of SciencesShanghaiPeople’s Republic of China
  3. 3.Yuxi Normal UniversityYuxiPeople’s Republic of China

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