NDLI: Water-soluble CdSe/CdS and CdSe/Cd$_{ x }$Zn$_{1−x }$S quantum dots with tunable and narrow luminescent spectra and high photoluminescence efficiency

Content Provider	Springer Nature Link
Author	Zhang, Qiang Cao, Yongqiang Shen, Jianxing Yang, Ping
Copyright Year	2013
Abstract	Nearly monodisperse CdSe/CdS and CdSe/Cd$_{ x }$Zn$_{1−x }$S core–shell quantum dots (QDs) were synthesized by the epitaxial growth of CdS or Cd$_{ x }$Zn$_{1–x }$S shells on pre-synthesized CdSe cores through a facile organic route. The thickness effect of CdS and Cd$_{ x }$Zn$_{1−x }$S shells on the properties of resulting core–shell QDs, such as the photoluminescence (PL) efficiency, PL full width at half-maximum (fwhm), and PL decay lifetime, were investigated. The PL efficiency is greatly enhanced from 9 % of CdSe cores to 64 % of CdSe/Cd$_{ x }$Zn$_{1−x }$S core–shell QDs. The PL spectra are narrowed after coating (fwhm ~28–32 nm). The alloy Cd$_{ x }$Zn$_{1−x }$S shell is especially effective to enhance the PL efficiency, and it leads to a smaller red-shift in PL spectra compared with that of the CdS shell. The water-soluble CdSe/Cd$_{ x }$Zn$_{1−x }$S core–shell QDs were obtained by the encapsulation of amphiphilic poly(styrene-co-maleic anhydride) (PSMA)–ethanolamine (EA) polymers, which was initially dispersed in oil phase. It was found that the CdSe/Cd$_{ x }$Zn$_{1−x }$S QDs in water still retained a high PL efficiency as well as a small value in fwhm after encapsulating the CdSe/Cd$_{ x }$Zn$_{1−x }$S QDs with PSMA–EA polymers, expanding the applications of these core–shell QDs in aqueous environment.
Starting Page	1
Ending Page	11
Page Count	11
File Format	PDF
ISSN	13880764
Journal	Journal of Nanoparticle Research
Volume Number	15
Issue Number	8
e-ISSN	1572896X
Language	English
Publisher	Springer Netherlands
Publisher Date	2013-07-24
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Quantum dots Core–shell Photoluminescence efficiency Phase transfer Nanotechnology Inorganic Chemistry Characterization and Evaluation of Materials Physical Chemistry Optics, Optoelectronics, Plasmonics and Optical Devices
Content Type	Text
Resource Type	Article
Subject	Chemistry Nanoscience and Nanotechnology Atomic and Molecular Physics, and Optics Condensed Matter Physics Bioengineering Modeling and Simulation

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