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


Ontology type: schema:ScholarlyArticle     


Article Info

DATE

2017-04-27

AUTHORS

Yanyan Zhang, Jinfeng Xia, Caixia Li, Guohong Zhou, Wei Yang, Dandan Wang, Huiping Zheng, Yuansheng Du, Xi Li, Qiang Li

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. More... »

PAGES

9424-9429

Identifiers

URI

http://scigraph.springernature.com/pub.10.1007/s10853-017-1131-5

DOI

http://dx.doi.org/10.1007/s10853-017-1131-5

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1085081424


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