Evolution of Luminescence with Shell's Thickness in Colloidal CdSe/CdS
| Autor: | Shen Li, YE Yong-Hong, Wang Zhi-Bing, Zhang Jia-Yu, Liang Da-Shun, Cui Yi-Ping |
|---|---|
| Rok vydání: | 2008 |
| Předmět: |
Photoluminescence
Materials science Shell (structure) Physics::Optics General Physics and Astronomy Quantum yield Nanotechnology Condensed Matter::Mesoscopic Systems and Quantum Hall Effect Microstructure Molecular physics Core (optical fiber) Condensed Matter::Materials Science symbols.namesake Quantum dot symbols Luminescence Raman spectroscopy |
| Zdroj: | Chinese Physics Letters. 25:4431-4434 |
| ISSN: | 1741-3540 0256-307X |
| DOI: | 10.1088/0256-307x/25/12/069 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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