Journal
CHEMISTRY OF MATERIALS
Volume 26, Issue 2, Pages 1154-1160Publisher
AMER CHEMICAL SOC
DOI: 10.1021/cm403518a
Keywords
semiconductor; nanoctystals; giant core/shell Raman; nonblinking
Funding
- BelSPo [IAP 7.35]
- FWO-Vlaanderen [G.0760.12]
- German Research Foundation [LA 2901/1-1]
- Max Kade Foundation
- Hercules Foundation [AUGE/09/024]
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We report on the flash synthesis of CdSe/CdS core shell quantum dots (QDs). This new method, based on a seeded growth approach and using an excess of a carboxylic acid, leads to an isotropic and epitaxial growth of a CdS shell on a wurtzite CdSe core. The method is particularly fast and efficient, allowing the controllable growth of very thick CdS shells (up to 6.7 nm in the present study) in no more than 3 min, which is considerably shorter than in previously reported methods. The prepared materials present state-of-the-art properties with narrow emission and high photoluminescence quantum yields, even for thick CdS shells. Additionally, Raman analyses point to an alloyed interface between the core and the shell, which, in conjunction with the thickness of the CdS shell, results in the observed considerable reduction of the blinking rate.
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