Temperature-dependent Luminescence Properties of CdS/ZnS Core/Shell Nanocrystals with Different Shell Thickess
We report the preparation and optical properties of CdS/ZnS nanocrystals (NCs) are repor-ted. By using the successive ion layer adhesion and reaction (SILAR) technique with few surfactants,we synthesized four samples with different shell thickness, including CdS core NCs and CdS/ZnS core/shell NCs with 1～3 ZnS monolayers (ML) are synthesized. It is observed that the photoluminescence (PL) quantum yield (QY) of the CdS/ZnS core/shell NCs with shell thickness of 1 ML is nearly 11 times more than the bare-core CdS NCs. Moreover, with the shell thickness increased (two or three ML), the PL QY is decreased. The temperature-dependent optical spectra is measured also, it is bound CdS/ZnS core/shell NCs have particular optical properties as the corresponding bare-core CdS NCs.
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