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Preparation of Highly Luminescent CdTe/CdS Core/Shell Quantum Dots
Author(s) -
Wang Jian,
Long Yitao,
Zhang Yuliang,
Zhong Xinhua,
Zhu Linyong
Publication year - 2009
Publication title -
chemphyschem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.016
H-Index - 140
eISSN - 1439-7641
pISSN - 1439-4235
DOI - 10.1002/cphc.200800672
Subject(s) - quantum dot , cadmium telluride photovoltaics , photoluminescence , luminescence , nanocrystal , shell (structure) , core (optical fiber) , materials science , nanotechnology , semiconductor , infrared , optoelectronics , chemical engineering , composite material , optics , physics , engineering
A good balance: Oil‐soluble CdTe/CdS core/shell quantum dots (QDs) that emit in the visible and near‐infrared spectral regions with quantum yields up to 92 % (see figure) are prepared by balancing the coordinating capacity and the activation effect of selected surfactants.An effective shell‐coating route is developed for covering oil‐soluble CdTe quantum dots (QDs), which usually tend to aggregate during the heating‐up process involved in shell formation. The new route is based on balancing the coordinating capacity and the activation effect of selected surfactants. The thus obtained highly luminescent CdTe/CdS core/shell QDs exhibit photoluminescence quantum yields as high as 92 %—among the best results obtained so far for luminescent semiconductor nanocrystals. By changing the size of the CdTe core, or the thickness of the CdS shell, the emission colors of the obtained core/shell nanocrystals can be tuned between the visible and near‐infrared regions of the spectrum following an identical procedure.