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Evolution of Luminescence with Shell's Thickness in Colloidal CdSe/CdS Core/Shell Quantum Dots |
| LIANG Da-Shun1, SHEN Li1, WANG Zhi-Bing1, CUI Yi-Ping1, ZHANG Jia-Yu1, YE Yong-Hong 2 |
| 1Advanced Photonics Center, Southeast University, Nanjing 2100962Department of Physics, Nanjing Normal University, Nanjing 210097 |
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| Cite this article: |
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LIANG Da-Shun, SHEN Li, WANG Zhi-Bing et al 2008 Chin. Phys. Lett. 25 4431-4434 |
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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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Received: 12 September 2008
Published: 27 November 2008
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| PACS: |
78.67.Hc
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(Quantum dots)
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78.67.-n
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(Optical properties of low-dimensional, mesoscopic, and nanoscale materials and structures)
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