Evolution of Luminescence with Shell's Thickness in Colloidal CdSe/CdS Core/Shell Quantum Dots |
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| Authors: | LIANG Da-Shun SHEN Li WANG Zhi-Bing CUI Yi-Ping ZHANG Jia-Yu YE Yong-Hong |
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| Affiliation: | Advanced Photonics Center, Southeast University, Nanjing 210096Department of Physics, Nanjing Normal University, Nanjing 210097 |
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| Abstract: | We synthesize colloidal CdSe/CdS core/shell quantum dots with different shell thicknesses, and there are five samples including CdSe core dots, and CdSe/CdS core/shell dots with 1-4 CdS layers. X-ray diffraction and Raman measurements indicate that the stress in CdSe core becomes stronger with the increasing shell thickness, and the optical measurements show that when the shell becomes thicker, the photoluminescence quantum yield is enhanced, and the radiative decay is also expedited. The temperature-dependent optical spectra are measured. The relation between the microstructure and the optical properties is discussed. |
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| Keywords: | 78.67.Hc 78.67.-n |
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