Growth and photoluminescence study of ZnTe quantum dots
| Autor: | Yang-Fang Chen, M. H. Chieng, Y. H. Change, Chih-Hsin Tsai, M. C. Harris Liao |
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| Rok vydání: | 1999 |
| Předmět: |
Materials science
Photoluminescence business.industry Exciton Binding energy General Physics and Astronomy Activation energy Condensed Matter::Mesoscopic Systems and Quantum Hall Effect Blueshift Condensed Matter::Materials Science Quantum dot Optoelectronics Emission spectrum Metalorganic vapour phase epitaxy business |
| Zdroj: | Journal of Applied Physics. 86:4694-4696 |
| ISSN: | 1089-7550 0021-8979 |
| Popis: | ZnTe quantum dots embedded in ZnS were grown successfully by controlling the flow duration in a metalorganic chemical vapor deposition system. Blueshift as large as 250 meV was observed in photoluminescence measurement, and the emission persists up to room temperature. The amount of blueshift decreases with increasing quantum dot size and for large quantum dots, no photoluminescence could be detected. From studying the temperature-dependent integrated intensity of the emission spectra, it is found that the activation energy for the quenching of photoluminescence increases with decreasing quantum dot size, and is identified as the binding energy of exciton in ZnTe quantum dot. |
| Databáze: | OpenAIRE |
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