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Synthesis of Extremely Small CdSe and Highly Luminescent CdSe/CdS Core–Shell Nanocrystals via a Novel Two‐Phase Thermal Approach
Author(s) -
Pan D.,
Wang Q.,
Jiang S.,
Ji X.,
An L.
Publication year - 2005
Publication title -
advanced materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.707
H-Index - 527
eISSN - 1521-4095
pISSN - 0935-9648
DOI - 10.1002/adma.200401425
Subject(s) - materials science , quantum dot , luminescence , shell (structure) , nanocrystal , core (optical fiber) , quantum yield , photoluminescence , optoelectronics , phase (matter) , nanotechnology , optics , fluorescence , composite material , chemistry , physics , organic chemistry
An environmentally harmless method of synthesizing extremely small CdSe and highly luminescent CdSe/CdS core–shell quantum dots (see Figure) with CdSe cores of 1.2–1.5 nm diameter is reported. The CdSe/CdS core–shell quantum dots exhibit 60–80 % quantum yield at room temperature. The emission peak is tunable from 445 to 517 nm (purplish blue to green yellow) by increasing the diameter of the CdSe core and/or the thickness of the CdS shell.