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- Title
Water-soluble CdSe/CdS and CdSe/CdZnS quantum dots with tunable and narrow luminescent spectra and high photoluminescence efficiency.
- Authors
Zhang, Qiang; Cao, Yongqiang; Shen, Jianxing; Yang, Ping
- Abstract
Nearly monodisperse CdSe/CdS and CdSe/CdZnS core-shell quantum dots (QDs) were synthesized by the epitaxial growth of CdS or CdZnS shells on pre-synthesized CdSe cores through a facile organic route. The thickness effect of CdS and CdZnS 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/CdZnS core-shell QDs. The PL spectra are narrowed after coating (fwhm ~28-32 nm). The alloy CdZnS 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/CdZnS 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/CdZnS QDs in water still retained a high PL efficiency as well as a small value in fwhm after encapsulating the CdSe/CdZnS QDs with PSMA-EA polymers, expanding the applications of these core-shell QDs in aqueous environment.
- Subjects
OPTICAL properties of quantum dots; MONODISPERSE colloids; OPTICAL properties of cadmium selenide; TUNABLE lasers; LUMINESCENCE; PHOTOLUMINESCENCE; EPITAXY
- Publication
Journal of Nanoparticle Research, 2013, Vol 15, Issue 8, p1
- ISSN
1388-0764
- Publication type
Article
- DOI
10.1007/s11051-013-1830-z