Composition-tunable ZnxCd1-xSe nanocrystals with high luminescence and stability
High-quality ZnxCd1-xSe nanocrystals have been successfully prepared at high temperature by incorporating stoichiometric amounts of Zn and Se into pre-prepared CdSe nanocrystals. With increasing Zn content, a composition-tunable emission across most of the visible spectrum has been demonstrated by a...
| Main Authors: | , , , , |
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| Other Authors: | |
| Format: | Journal Article |
| Language: | English |
| Published: |
2012
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| Online Access: | https://hdl.handle.net/10356/94281 http://hdl.handle.net/10220/7438 |
| _version_ | 1826114064019881984 |
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| author | Zhong, Xinhua Han, Ming-Yong Dong, Zhili White, Timothy John Knoll, Wolfgang |
| author2 | School of Materials Science & Engineering |
| author_facet | School of Materials Science & Engineering Zhong, Xinhua Han, Ming-Yong Dong, Zhili White, Timothy John Knoll, Wolfgang |
| author_sort | Zhong, Xinhua |
| collection | NTU |
| description | High-quality ZnxCd1-xSe nanocrystals have been successfully prepared at high temperature by incorporating stoichiometric amounts of Zn and Se into pre-prepared CdSe nanocrystals. With increasing Zn content, a composition-tunable emission across most of the visible spectrum has been demonstrated by a systematic blue-shift in emission wavelength. The photoluminescence (PL) properties for the obtained ZnxCd1-xSe nanocrystals (PL efficiency of 70−85%, fwhm = 22−30 nm) are comparable to those for the best reported CdSe-based QDs. In particular, they also have good PL properties in the blue spectral range. Moreover, the alloy nanocrystals can retain their high luminescence (PL efficiency of over 40%) when dispersed in aqueous solutions and maintain a symmetric peak shape and spectral position under rigorous experimental conditions. A rapid alloying process was observed at a temperature higher than “alloying point”. The mechanism of the high luminescence efficiency and stability of ZnxCd1-xSe nanocrystals is explored. |
| first_indexed | 2024-10-01T03:33:23Z |
| format | Journal Article |
| id | ntu-10356/94281 |
| institution | Nanyang Technological University |
| language | English |
| last_indexed | 2024-10-01T03:33:23Z |
| publishDate | 2012 |
| record_format | dspace |
| spelling | ntu-10356/942812020-06-01T10:01:42Z Composition-tunable ZnxCd1-xSe nanocrystals with high luminescence and stability Zhong, Xinhua Han, Ming-Yong Dong, Zhili White, Timothy John Knoll, Wolfgang School of Materials Science & Engineering DRNTU::Engineering::Materials::Nanostructured materials High-quality ZnxCd1-xSe nanocrystals have been successfully prepared at high temperature by incorporating stoichiometric amounts of Zn and Se into pre-prepared CdSe nanocrystals. With increasing Zn content, a composition-tunable emission across most of the visible spectrum has been demonstrated by a systematic blue-shift in emission wavelength. The photoluminescence (PL) properties for the obtained ZnxCd1-xSe nanocrystals (PL efficiency of 70−85%, fwhm = 22−30 nm) are comparable to those for the best reported CdSe-based QDs. In particular, they also have good PL properties in the blue spectral range. Moreover, the alloy nanocrystals can retain their high luminescence (PL efficiency of over 40%) when dispersed in aqueous solutions and maintain a symmetric peak shape and spectral position under rigorous experimental conditions. A rapid alloying process was observed at a temperature higher than “alloying point”. The mechanism of the high luminescence efficiency and stability of ZnxCd1-xSe nanocrystals is explored. 2012-01-06T02:56:08Z 2019-12-06T18:53:39Z 2012-01-06T02:56:08Z 2019-12-06T18:53:39Z 2003 2003 Journal Article Zhong, X., Han, M.-Y., Dong, Z. L., White, T. J., & Knoll, W. (2003). Composition-tunable ZnxCd1-xSe nanocrystals with high luminescence and stability. Journal of the American chemical society, 125(28), 8589-8594. https://hdl.handle.net/10356/94281 http://hdl.handle.net/10220/7438 10.1021/ja035096m en Journal of the American chemical society © 2003 American Chemical Society. |
| spellingShingle | DRNTU::Engineering::Materials::Nanostructured materials Zhong, Xinhua Han, Ming-Yong Dong, Zhili White, Timothy John Knoll, Wolfgang Composition-tunable ZnxCd1-xSe nanocrystals with high luminescence and stability |
| title | Composition-tunable ZnxCd1-xSe nanocrystals with high luminescence and stability |
| title_full | Composition-tunable ZnxCd1-xSe nanocrystals with high luminescence and stability |
| title_fullStr | Composition-tunable ZnxCd1-xSe nanocrystals with high luminescence and stability |
| title_full_unstemmed | Composition-tunable ZnxCd1-xSe nanocrystals with high luminescence and stability |
| title_short | Composition-tunable ZnxCd1-xSe nanocrystals with high luminescence and stability |
| title_sort | composition tunable znxcd1 xse nanocrystals with high luminescence and stability |
| topic | DRNTU::Engineering::Materials::Nanostructured materials |
| url | https://hdl.handle.net/10356/94281 http://hdl.handle.net/10220/7438 |
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