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| - CdSe/CdS/ZnS and CdSe/ZnSe/ZnS Core−Shell−Shell Nanocrystals
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| - We report the synthesis and characterization of highly luminescent colloidal nanocrystals consisting of CdSecores protected with double inorganic shells (core−shell−shell nanocrystals). The outer ZnS shell providesefficient confinement of electron and hole wave functions inside the nanocrystal as well as high photochemicalstability. Introducing the middle shell (CdS or ZnSe) sandwiched between CdSe core and ZnS outer shellallows considerable reducing strain inside nanocrystals because CdS and ZnSe have the lattice parameterintermediate to those of CdSe and ZnS. In contrast to CdSe/ZnS core−shells, in the core−shell−shellnanocrystals ZnS shell grows nearly defect free. Due to high quality of the ZnS shell, the core−shell−shellnanocrystals exhibit PL efficiency and photostability exceeding those of CdSe/ZnS nanocrystals. Preferentialgrowth of the middle CdS shell in one crystallographic direction allows engineering the shape and luminescencepolarization of the core−shell−shell nanocrystals.
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