Synthesis of Extremely Small CdSe and Highly Luminescent CdSe/CdS Core–Shell Nanocrystals via a Novel Two-Phase Thermal Approach


  • We thank Dr. Zhaohui Su for his valuable and constructive discussion. This work was supported by the National Natural Science Foundation of China for General (50303017, 50373044, 90101001) and Major (50390090, 20490220), the Chinese Academy of Sciences (KJCX2-SW-H07), and the Fund for Distinguished Young Scholars of China (59825113), and subsidized by the Special Funds for Major State Basic Research Projects (No. 2003CB615600) and the Special Pro-Funds for Major State Basic Research Projects (2002CCAD4000).


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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.