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Highly Luminescent CdSe/ZnS Nanocrystals Synthesized Using a Single‐Molecular ZnS Source in a Microfluidic Reactor
Author(s) -
Wang H.,
Nakamura H.,
Uehara M.,
Yamaguchi Y.,
Miyazaki M.,
Maeda H.
Publication year - 2005
Publication title -
advanced functional materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 6.069
H-Index - 322
eISSN - 1616-3028
pISSN - 1616-301X
DOI - 10.1002/adfm.200400164
Subject(s) - photoluminescence , materials science , microreactor , quantum yield , luminescence , nanocrystal , quantum dot , reagent , yield (engineering) , nanotechnology , microfluidics , chemical engineering , optoelectronics , fluorescence , catalysis , chemistry , optics , organic chemistry , composite material , physics , engineering
An air‐stable, low‐toxicity, single‐molecular source for ZnS is demonstrated to be an appropriate reagent to synthesize highly luminescent ZnS‐capped CdSe with a narrow size distribution. A photoluminescence quantum yield of above 50 % and a photoluminescence peak full width at half maximum of around 32 nm could be obtained after synthesis using a microreactor. The surface of the ZnS‐capped CdSe nanocrystals can be hydrophilic, while retaining the high quantum yield. Microscopic observation shows that accurate time control, which could be achieved by using a microreactor, is important to avoid the formation of many isolated ZnS particles and the deterioration of the luminescence.